JP4106451B2 - Vehicle drive device and forward / reverse switching mechanism of vehicle drive device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle drive device and a forward / reverse switching mechanism of the vehicle drive device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a vehicle drive device using a belt type continuously variable transmission in which an engine is placed horizontally is disclosed in, for example, Japanese Patent Application Laid-Open No. 6-221386, and as shown in FIG. A fluid coupling 102, a forward / reverse switching mechanism 105, and a belt-type continuously variable transmission 110 are provided coaxially in the vehicle body width direction, and an output continuously variable by the continuously variable transmission 110 is supplied to a differential device 130 via a reduction mechanism 120. And is distributed to the left and right wheels by the differential device 130.
[0003]
Explaining the configuration of each part, the forward / reverse switching mechanism 105 meshes with a sun gear 106a that always rotates integrally with an input shaft 103 connected to a crankshaft 101a of the engine 101 via a fluid coupling 102, and a ring gear 106b. A double pinion planetary gear 106 is also provided that includes a plurality of pinion gears 106c and 106d that mesh with the sun gear 106a and the ring gear 106b, and a carrier 106e that rotatably supports the pinion gears 106c and 106d. A forward clutch 107 that selectively transmits power between the carrier 106e and the output shaft 103 is disposed, and the ring gear 106b is configured to be fixed to the casing 109 by a reverse brake 108.
[0004]
The belt type continuously variable transmission 110 is provided on a primary shaft 111 disposed coaxially with the input shaft 103, a secondary shaft 112 disposed in parallel with the primary shaft 111, and the primary shaft 111 and the secondary shaft 112, respectively. The primary pulley 113 and the secondary pulley 114, and the drive belt 115 wound between the pulleys 113 and 114, and the drive belt for the pulleys 113 and 114 by changing the pulley groove width of the pulleys 113 and 114. The effective winding diameter ratio of 115 is changed to change continuously.
[0005]
The reduction mechanism 120 includes a drive gear 121 provided on the secondary shaft 112 of the continuously variable transmission 110, an idler gear 122 that meshes with the drive gear 121, and a pinion gear 123 that meshes with the final gear 132 of the differential device 130. The pinion gear 123 is integrally coupled by an idler shaft 124 and is rotatably supported by the casing 109.
[0006]
The differential device 130 includes a hollow differential case 131 that is rotatably supported by a casing 109, a final gear 132 that meshes with the pinion gear 123 of the reduction mechanism 120 is provided in the differential case 131, and the differential case 131 is provided in the differential case 131. A pair of pinions 134 are provided by pinion shafts 133 supported at both ends, and left and right side gears 135 mesh with both pinions 134, and power is transmitted from both side gears 135 to left and right drive wheels via joints and axle shafts (not shown). It is configured as follows.
[0007]
In such a configuration, during forward movement, the forward clutch 107 disposed in the forward / reverse switching mechanism 105 is engaged, and the reverse brake 108 is released. As a result, the sun gear 106a and the carrier 106d rotate together, the rotation of the input shaft 103 by the engine 101 is transmitted to the carrier 106e of the planetary gear 106, and the input shaft 103 and the primary shaft 111 are united in the same direction. Rotate. Then, the power continuously variable by the continuously variable transmission 110 is output to the secondary shaft 112, transmitted to the differential device 130 via the reduction mechanism 120, and distributed and transmitted to the left and right drive wheels by the differential device 130.
[0008]
On the other hand, at the time of reverse, the forward clutch 107 is released and the reverse brake 108 is engaged. As a result, the ring gear 106b is fixed to the casing 109, and the rotation of the input shaft 103 is transmitted to the sun gear 106a of the planetary gear 106. The planetary gear 106 rotates along the ring gear 106b while the pinions 106c and 106d engaged with each other by the input-side sun gear 106a are rotated in the reverse direction to decelerate and drive the carrier 106e in the opposite direction to the sun gear 106a. The continuously variable power is output to the secondary shaft 112, transmitted to the differential device 130 via the reduction mechanism 120, and distributed to the left and right drive wheels by the differential device 130.
[0009]
Further, at the neutral time, the sun gear 106a of the planetary gear 106 is rotationally driven by releasing both the forward clutch 107 and the reverse brake 108, but the planetary gear 106 idles and no power is transmitted thereafter.
[0010]
Accordingly, forward / reverse switching can be performed by switching the operation of the forward clutch 107 and the reverse brake 108.
[0011]
[Problems to be solved by the invention]
According to Japanese Patent Laid-Open No. Hei 6-221386, the operation of the planetary gear 106 is switched by switching control of the forward clutch 107 and the reverse brake 108 of the forward / reverse switching mechanism 105 to perform forward / backward switching.
[0012]
However, the planetary gear 106 used for the forward / reverse switching mechanism 105 is required to have high accuracy and has a complicated structure because the forward clutch 107 and the reverse brake 108 are disposed. As the shape becomes larger, a lot of manufacturing costs are required.
[0013]
When the rotation of the drive wheels is stopped, such as when the vehicle is stopped, the secondary shaft of the continuously variable transmission 110 is driven by the stopped drive wheels via the differential device 130 and the reduction mechanism 120 that are configured to transmit power to each other. The rotation of 112 is restricted. In the state where the operation of the continuously variable transmission 110 is stopped due to the rotation stop of the secondary shaft 112 due to this restriction, the groove width of the primary pulley 113 and the secondary pulley 114 cannot be controlled, and the gear ratio control when the vehicle is stopped I can't. As a result, for example, if the vehicle stops while the continuously variable transmission 110 is not sufficiently controlled to shift to the maximum gear ratio (LOW side), the gear ratio at the time of stop is maintained, and the gear shift is performed at the next vehicle start. Starting from a specific state may affect smooth vehicle starting. This is particularly noticeable when forward and backward movements such as garage entry and parallel parking are repeated.
[0014]
Accordingly, a first object of the present invention made in view of the above points is to provide a vehicle drive device capable of suppressing the manufacturing cost by simplifying the structure and controlling the shift of the belt-type transmission when the vehicle is stopped. There is to do.
[0015]
A second object of the present invention is to provide a forward / reverse switching mechanism for a vehicle drive device that can reduce manufacturing costs by simplifying the structure.
[0016]
[Means for Solving the Problems]
The invention of the vehicle drive device according to claim 1 that achieves the first object includes a primary pulley having a variable pulley groove width provided on a primary shaft and a secondary pulley having a variable pulley groove width provided on a secondary shaft. A belt-type continuously variable transmission that changes the ratio of the effective winding diameter of the drive belt to each pulley by changing the pulley groove width of each pulley and changing the pulley groove width of each pulley, and forward / reverse switching In a vehicle drive device including a forward / reverse switching mechanism and a differential device that transmits power to drive wheels, the forward / reverse switching mechanism includes a rotary shaft that is rotatably supported by a fixed member, and a rotary shaft that rotates on the rotary shaft. A pinion shaft disposed orthogonally to the shaft center, a pinion gear rotatably supported on the pinion shaft, and a pinion gear rotatably supported on the rotation shaft. An output shaft provided with a side gear that is transmitted to the pinion gear and meshed with the pinion gear, a driven gear that is rotatably supported by the rotary shaft and transmitted from the secondary shaft, and is provided with a side gear that meshes with the pinion gear; A forward position where the driven gear and the rotating shaft are coupled so as to be able to transmit power, a retracted position where the rotating shaft is fixed to a fixed member, a neutral position which allows rotation between the driven gear and the rotating shaft and between the rotating shaft and the fixed member. And switching means for switching to each position.
[0017]
According to the first aspect of the present invention, the forward / reverse switching mechanism has a pinion gear provided on a pinion shaft provided on a rotary shaft supported by a fixed member, and an output shaft having a side gear meshed with the pinion gear on the rotary shaft is freely rotatable. A driven gear having a side gear that is transmitted by the secondary shaft and meshed with the pinion gear is rotatably arranged on the rotating shaft, and the rotating shaft is coupled to the driven gear and the rotating shaft so that power can be transmitted by the switching means, and the rotating shaft is a fixed member Before and after using a conventional planetary gear that requires high precision, and can be formed with a relatively simple configuration that switches between a retracted state that is coupled to the driven state and a neutral state that releases both the driven gear and the rotating shaft and the rotating shaft and the fixed member. The required accuracy of each component and the required accuracy of assembly Can be relaxed in width, it can be expected to reduce the significant production cost.
[0018]
In addition, for example, when switching from the forward position to the reverse position, or from the reverse position to the forward position, the driven gear becomes idle with respect to the output shaft by switching from the forward position or the reverse position to the neutral position, The continuously variable transmission can be controlled to shift to the maximum gear ratio, and smooth reverse or forward start can be ensured from the state in which the gear shift is controlled to the maximum gear ratio.
[0019]
According to a second aspect of the present invention, in the vehicle drive device according to the first aspect, the switching means includes a spline provided in the driven gear, a spline provided in the fixed member, the driven gear, and the fixed member. A hub provided on the rotating shaft and a sleeve that is always splined to the hub, and the sleeve is in a neutral position that meshes only with the hub, and a forward position that meshes with both the hub and the spline of the driven gear. And a retreat position that meshes with the hub and the spline of the fixing member.
[0020]
According to the invention of claim 2, the spline formed on the driven gear, the spline provided on the fixed member, the hub provided on the rotating shaft, and the sleeve selectively engaged with these, and a compact switching means. Can be formed.
[0021]
According to a third aspect of the invention, the forward / reverse switching mechanism for the vehicle drive device according to claim 3 achieves the second object, wherein the power from the engine side is switched forward / backward and output to the differential side. In the switching mechanism, a rotation shaft that is rotatably supported by the fixed member, a pinion shaft that is disposed on the rotation shaft perpendicular to the axis of the rotation shaft, and a pinion gear that is rotatably supported by the pinion shaft; An output shaft provided with a side gear that is rotatably supported by the rotating shaft and is transmitted to the differential side, and meshed with the pinion gear; and is rotatably supported by the rotating shaft and transmitted from the engine side. A driven gear provided with a side gear that meshes with the pinion gear, a forward position that couples the driven gear and the rotating shaft so that power can be transmitted, and the rotating shaft are fixed. Characterized by comprising a switching means for switching the respective positions of the retracted position for fixing to the timber.
[0022]
According to the invention of claim 3, the forward / reverse switching mechanism has a pinion gear provided on a pinion shaft provided on a rotary shaft supported by a fixed member, and an output shaft having a side gear engaged with the pinion gear on the rotary shaft is freely rotatable. A driven gear having a side gear that is transmitted from the engine side and meshed with the pinion gear is rotatably arranged on the rotating shaft, and the rotating shaft is coupled to the driven gear and the rotating shaft so that power can be transmitted by the switching means, and the rotating shaft is a fixed member. Compared to the conventional forward / reverse switching mechanism using a planetary gear, which is formed with a relatively simple configuration that switches to a reverse state that is coupled to the conventional, the required accuracy of each component and the required accuracy of assembly of the components Can be greatly eased, and a significant reduction in manufacturing cost can be expected.
[0023]
According to a fourth aspect of the present invention, in the forward / reverse switching mechanism of the vehicle drive device according to the third aspect, the switching means is between the driven gear and the rotating shaft and between the rotating shaft and the fixed member that are switched by the switching means. It has a neutral position that allows rotation.
[0024]
According to the fourth aspect of the present invention, by providing the neutral position to the third aspect, the usability can be improved.
[0025]
According to a fifth aspect of the present invention, in the forward / reverse switching mechanism of the vehicle drive device according to the fourth aspect, the switching means includes a spline provided in the driven gear, a spline provided in the fixed member, and the driven gear. And a hub provided on a rotating shaft between the fixed member and a sleeve that is always spline-fitted to the hub, and the sleeve is in a neutral position that meshes only with the hub, and the hub and the spline of the driven gear. It moves to each position of the advance position which meshes together, and the retreat position which meshes with the said hub and the spline of a fixing member.
[0026]
According to the invention of claim 5, the input means can be compactly configured with a simple structure by a spline formed on the driven gear, a spline provided on the fixed member, a hub provided on the rotating shaft, and a sleeve selectively engaging with the hub. Can be formed.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a vehicle drive device and a forward / reverse switching mechanism for a vehicle drive device according to the present invention will be described below with reference to FIGS.
[0028]
FIG. 1 is a skeleton diagram showing an overall outline of a vehicle drive device 1. This vehicle drive device 1 includes an engine (not shown), a torque converter or fluid coupling housed in a casing 2 that is a fixed member, and in this embodiment, a torque converter 3, a starting clutch 7, and a belt type continuously variable transmission 10. The output from the secondary shaft 12 of the continuously variable transmission 10 is provided coaxially in the vehicle body width direction, and is transmitted to the differential device 40 via the forward / reverse switching mechanism 20 having a reduction function, and is transmitted to the left and right wheels by the differential device 40. It is configured to dispense.
[0029]
The configuration of each part will be described. The torque converter 3 is coupled to the input shaft 4 that is disposed coaxially with the crankshaft of the engine, the impeller 5 that is coupled to the crankshaft of the engine, and the impeller 5 that faces the impeller 5. The oil in the impeller 5 is discharged to the outside by the centrifugal force by the rotation of the impeller 5, and the oil flows in from the outside of the turbine 6 to give the turbine 6 a torque in the same direction as the rotation of the impeller 5. By transmitting, the input shaft 4 coupled to the turbine 6 is rotationally driven.
[0030]
The continuously variable transmission 10 is arranged coaxially with the input shaft 4 and connected to the input shaft 4 via the starting clutch 7, and is arranged in parallel with the primary shaft 11 so that the continuously variable transmission 10 A secondary shaft 12 serving as an output shaft; a primary pulley 13 and a secondary pulley 14 provided on the primary shaft 11 and the secondary shaft 12; and a drive belt 15 wound between the pulleys 13 and 14. Yes. The primary pulley 13 and the secondary pulley 14 are driven by changing the width of each pulley groove of the primary pulley 13 and the secondary pulley 14 by the hydraulic actuator 16 provided on the primary pulley 13 and the hydraulic actuator 17 provided on the secondary pulley 14. The ratio of the effective winding diameter of the belt 15 is changed to change the speed steplessly.
[0031]
That is, during upshifting, the pulley groove width of the primary pulley 13 is decreased to increase the effective winding diameter of the drive belt 15 around the primary pulley 13, while the pulley groove width of the secondary pulley 14 is increased to increase the drive belt 15 relative to the secondary pulley 14. By changing the effective winding diameter of the gear, the speed control is performed from the speed ratio maximum side (LOW side) to the speed ratio minimum side (OD side). On the other hand, when downshifting, the pulley groove width of the primary pulley 13 is increased to reduce the effective winding diameter of the drive belt 15, and the pulley groove width of the secondary pulley 14 is decreased to increase the effective winding diameter of the drive belt 15. To control the shift from the OD side to the LOW side.
[0032]
The forward / reverse switching mechanism 20 is shown in cross section in FIG. 1 and FIG. 2 and is an enlarged view of part A in FIG. The rotary shaft 23 is rotatably supported by the casing 2 via the rotary shaft 23. One end of the rotary shaft 23 opens at the shaft end, and a lubricating oil supply hole 24 is formed along the shaft center. A pinion shaft 25 is disposed at a substantially central portion in the length direction of the shaft 23 so as to be perpendicular to the shaft center. At both ends of the pinion shaft 25 protruding from the rotation shaft 23, pinion gears 26 that are fitted into respective pinion fitting portions 23a that are recessed in a spherical shape on the rotation shaft 23 and that are prevented from coming off by clips 27 are rotatable. It is pivotally supported.
[0033]
An output shaft 28 having a drive gear 28a meshed with the final gear 42 of the differential device 40 and a side gear 28b meshed with each pinion gear 26 is rotatably supported on the rotary shaft 23 with a pinion gear 26 therebetween, and is continuously variable. A driven gear 30 in which a side gear 30b that meshes with a drive gear 29 provided on the transmission 10 secondary shaft 12 and meshes with each pinion gear 26 is rotatably supported, and a switching means 31 is provided between the driven gear 30 and the casing 2. Has been placed.
[0034]
Lubricating oil supply holes 24 drilled in the rotating shaft 23 have sliding portions between the rotating shaft 23 and the output shaft 28, pinion fitting portions 23a and pinion gears 26 through lubricating oil ejection holes 24a, 24b and 24c, respectively. And the sliding portion of the rotary shaft 23 and the driven gear 30 are connected to supply the lubricating oil from the lubricating oil supply hole 24 to the sliding portion.
[0035]
The switching means 31 includes a hub 32 that is provided by spline fitting with the rotary shaft 23 between the driven gear 30 and the bearing 22, a sleeve 33 that is always spline fitted to the hub 32, and a spline 30 a that is provided on the driven gear 30. And a locking member 34 attached to the casing 2 by a mounting bolt 35 in the shape of a ring having a spline 34a formed at the tip thereof coaxially with the rotary shaft 23. Here, the sleeve 33 is in a neutral position N that meshes only with the hub 32, a forward position D that meshes with the hub 32 and the spline 30 a of the driven gear 30, and a reverse position R that meshes with the hub 32 and the spline 34 a of the locking member 34. It is comprised so that it can move to the extension direction of the rotating shaft 23 between these. The sleeve 33 is switched to the neutral position N, forward position D, and reverse position N by an actuator such as an electric motor, a hydraulic cylinder mechanism, or a pneumatic cylinder mechanism.
[0036]
When the sleeve 33 is in the forward position D, the driven gear 30 and the rotary shaft 23 are coupled via the sleeve 33 and the hub 32 so that power can be transmitted, and the driven gear 30 is driven from the drive gear 29 provided on the secondary shaft 12 of the continuously variable transmission 10. The power transmitted to is transmitted from the driven gear 30 to the rotary shaft 23 through the sleeve 33 and the hub 32 as shown by a thick line in FIG. 4A, and from the rotary shaft 23 to the pinion shaft 25 and the pinion gear. 26, and is transmitted from the driven gear 30 to the output shaft 28 via the pinion 26, and the driven gear 30, the rotary shaft 23, and the output shaft 28 rotate together in the same direction as the driven gear 30. The final gear 4 of the differential device 40 is driven by the drive gear 28a of the output shaft 28 that rotates integrally. For transmission to. At this time, the drive gear 29, the driven gear 30 and the drive gear 28a are decelerated in accordance with the gear specifications and transmitted to the final gear 42.
[0037]
Further, when the sleeve 33 is in the retracted position R, the transmission between the driven gear 30 and the rotary shaft 23 is released, and the rotary shaft 23 is locked to the locking member 34 via the hub 32 and the sleeve 33 and fixed to the housing 2. . The motive power input from the drive gear 29 provided on the secondary shaft 12 to the driven gear 30 is rotationally driven by the pinion gear 26 that meshes with the side gear 30b of the driven gear 30 as indicated by a thick line in FIG. The output shaft 28 that meshes with the side gear 28 b via the pinion gear 26 is driven to rotate in the direction opposite to the driven gear 30. Then, the power is transmitted to the final gear 42 of the differential device 40 by the drive gear 28 a of the output shaft 28. At this time, the drive gear 29, the driven gear 30, the drive gear 28a, the side gear 30b of the driven gear 30, the side gear 28b of the output shaft 28, and the like are decelerated and transmitted to the final gear 42.
[0038]
Further, when the sleeve 33 is in the neutral position N, the power input to the driven gear 30 from the drive gear 29 provided on the secondary shaft 12 is as follows. As shown in FIG. Even if it rotates, the rotating shaft 24 and the pinion gear 26 run idle, and no power is transmitted thereafter.
[0039]
The differential device 40 includes a hollow differential case 41 that is rotatably supported by the casing 2, and a final gear 42 that meshes with a drive gear 28 a formed on the output shaft 28 of the forward / reverse switching device 20 is provided in the differential case 41. In the differential case 41, a pair of pinions 44 are provided by pinion shafts 43 supported at both ends of the differential case 41. The left and right side gears 45 are engaged with both pinions 44, and a joint and an axle shaft (not shown) are connected from both side gears 45. Via the left and right drive wheels.
[0040]
Next, the operation of the vehicle drive device 1 configured as described above will be described.
[0041]
At the time of forward movement, the start clutch 7 is engaged, and the sleeve 33 of the switching means 31 of the forward / reverse switching mechanism 20 is set to the forward position D where the hub 32 and the spline 30a of the driven gear 30 are engaged together. As a result, the primary shaft 11 of the continuously variable transmission 10 is driven to rotate in the same direction as the engine via the torque converter 3 and the starting clutch 7 by the engine. Then, the power continuously variable by the continuously variable transmission 10 is output to the secondary shaft 12, and the driven gear 30 of the forward / reverse switching device 20 that meshes with the drive gear 29 provided on the secondary shaft 12 is rotationally driven.
[0042]
In the forward / reverse switching mechanism 20 in which the driven gear 30 is rotationally driven, the sleeve 33 is in the forward position D, the driven gear 30 and the rotary shaft 23 are coupled via the sleeve 33 and the hub 32 so that power can be transmitted. The power input to 30 is transmitted from the driven gear 30 to the rotating shaft 23 and also transmitted from the driven gear 30 to the output shaft 28 via the pinion 26, so that the driven gear 30, the rotating shaft 23, and the output shaft 28 rotate integrally. The final gear 42 of the differential device 40 is rotationally driven by the drive gear 28a of the output shaft 28 that integrally rotates in the same direction as the driven gear 30. Then, power is transmitted from the left and right side gears 45 of the differential device 40 to the left and right drive wheels via the joint and the axle shaft.
[0043]
Switching from this forward state to reverse, for example, is performed by stopping the vehicle and moving the sleeve 33 of the switching means 31 provided in the forward / reverse switching mechanism 20 from the forward position D to the reverse position R via the neutral position N. Done.
[0044]
At the time of this switching, the sleeve 33 is switched from the forward position D to the neutral position N, so that the coupling between the spline 30a of the driven gear 30 and the hub 32 is released, and the sleeve 33 is fitted only to the hub 32. The secondary shaft 12 of the continuously variable transmission 10 provided with the drive gear 29 that engages with the driven gear 30 is maintained in a rotatable state. Here, when the continuously variable transmission 10 is not sufficiently controlled to shift to the LOW side, the engaged state of the start clutch 7 is continuously maintained, and the rotation of the primary shaft 11 by the engine is continued. After the continuously variable transmission 10 is controlled to shift to the LOW side, the engagement of the starting clutch 7 is released.
[0045]
Thereafter, the sleeve 33 is switched from the neutral position N where the sleeve 33 is fitted only to the hub 32 to the retracted position R where the sleeve 33 is engaged with the spline 34a of the locking member 34. By switching the sleeve 33 to the reverse position R, power transmission between the driven gear 30 and the rotating shaft 23 of the forward / reverse switching mechanism 20 is released, the rotating shaft 23 is fixed to the locking member 32, and the starting clutch 7 is fastened. The
[0046]
As a result, the primary shaft 11 of the continuously variable transmission 10 is driven to rotate in the same direction as the engine via the torque converter 3 and the starting clutch 7 by the engine. Then, the power continuously variable by the continuously variable transmission 10 is output to the secondary shaft 12, and the driven gear 30 of the forward / reverse switching mechanism 20 that meshes with the drive gear 29 provided on the secondary shaft 12 is rotationally driven.
[0047]
The power input to the driven gear 30 rotates the output shaft 28 formed with the side gear 28b meshing with the side gear 30b of the driven gear 30 via the pinion gear 26 in the opposite direction to the driven gear 30, and the final gear of the differential device 40 is driven by the drive gear 28a. The gear 42 is rotationally driven. Then, power is transmitted from the differential device 40 to the left and right drive wheels, and the vehicle starts moving backward. At the time of this backward start, since the continuously variable transmission 10 is controlled to shift to the LOW side in advance, it can start smoothly from the state where the shift control is performed to the LOW side.
[0048]
Switching from the reverse state to the forward direction is performed by stopping the vehicle and moving the sleeve 33 of the switching means 31 provided in the forward / reverse switching mechanism 20 from the reverse position R to the forward position D via the neutral position N. Is called.
[0049]
At the time of switching, the sleeve 33 is switched from the retracted position R to the neutral position N, so that the sleeve 33 is disconnected from the spline 34a of the locking member 34 and the hub 32, and is fitted only to the hub 32. Is allowed to idle with respect to the output shaft 28 via the pinion gear 26 or the like, and the secondary shaft 12 of the continuously variable transmission 10 provided with the drive gear 29 that meshes with the driven gear 30 is maintained in a rotatable state. When the continuously variable transmission 10 is not sufficiently controlled to shift to the LOW side, the engagement state of the starting clutch 7 is continuously maintained, and the engine continues to drive the primary shaft 11 and continuously. The transmission 10 is controlled to shift to the LOW side, and smooth forward start from the state in which the transmission is controlled to the LOW side can be ensured.
[0050]
As a result, for example, in parallel parking in which the vehicle is repeatedly moved forward and backward, in the garage, etc., each start in the vehicle start after the parking is performed from the state where the continuously variable transmission 10 is controlled to be shifted to the LOW side. Thus, a smooth start of the vehicle is started, and maneuverability and handling are obtained.
[0051]
Further, the forward / reverse switching mechanism 20 is provided with a pinion gear 26 on a pinion shaft 25 provided on a rotary shaft 23 rotatably supported by the casing 2, and a drive gear 28 a meshing with the final gear 42 of the differential device 40 on the rotary shaft 23. An output shaft 28 formed with side gears 28b meshing with the pinion gears 26 is rotatably provided, and a driven gear 30 having side gears 30b meshed with the drive gears 29 provided on the secondary shaft 12 and meshed with the pinion gears 26 is rotational shafts. The configuration arranged to be freely rotatable at 23 can greatly reduce the required accuracy of each component member and the required accuracy of assembly of the component members as compared with the conventional forward / reverse switching mechanism using a planetary gear that requires high accuracy. Further, the switching means 31 is in a forward state in which the driven gear 30 and the rotary shaft 23 are coupled so as to be able to transmit power, in a reverse state in which the rotary shaft 23 is coupled to the casing 2, the driven gear 30, the rotary shaft 23, the rotary shaft 23, and the casing 2. Therefore, it is possible to expect a significant reduction in manufacturing cost.
[0052]
Further, the switching means 31 can be constituted by a hub 32 provided on the rotary shaft 23, a sleeve 33 meshing with the hub 32, a spline 30a of the driven gear 30, a locking member 34 formed with the spline 34a, and the like. Compared with a forward / reverse switching mechanism by switching operation using a forward clutch and a reverse brake formed by a plate clutch or a multi-plate brake, a significant simplification and compactness can be obtained, and manufacturing costs can be reduced.
[0053]
In addition, shortening between the torque converter and the continuously variable transmission is reduced compared to the drive device in which the torque converter, the forward / reverse switching mechanism, and the continuously variable transmission are arranged coaxially with the crankshaft of the conventional horizontally disposed engine. Thus, the overall length of the drive device in the vehicle width direction can be shortened, the drive device can be made compact, and improvement in in-vehicle performance in the engine room and workability in the engine room can be expected.
[0054]
【The invention's effect】
According to the vehicle drive device and the forward / reverse switching mechanism of the present invention described above, the forward / reverse switching mechanism is provided with the pinion gear on the pinion shaft provided on the rotating shaft that is pivotally supported by the fixed member, and meshes with the pinion gear on the rotating shaft. An output shaft on which side gears are formed is rotatably provided, and a driven gear having a side gear that is transmitted by the secondary shaft and meshes with the pinion gear is rotatably arranged on the rotary shaft, and the switching means can transmit power to the driven gear and the rotary shaft. It is formed with a relatively simple configuration that switches between a forward state in which it is coupled, a retracted state in which the rotating shaft is coupled to the casing, and a neutral state in which the coupling between the driven gear and the rotating shaft and the rotating shaft and the fixed member are both released. Compared to the forward / reverse switching mechanism using planetary gears, which require high accuracy, the required precision of each component is required. And required accuracy of assembly of the components can be greatly relaxed, it can be expected drastically reduce manufacturing cost.
[0055]
In addition, for example, when switching from the forward state to the reverse state, or from the reverse state to the forward state, the neutral state is switched and the driven gear becomes idle with respect to the output shaft, and the continuously variable transmission in the stopped state is set to LOW. The shift can be controlled to the side, and smooth reverse or forward start from the state where the shift control is performed to the LOW side can be ensured.
[Brief description of the drawings]
FIG. 1 is a skeleton diagram showing an overall outline of a vehicle drive device according to the present invention.
FIG. 2 is a cross-sectional view of a main part of a forward / reverse switching mechanism.
FIG. 3 is an enlarged view of a portion A in FIG.
4A and 4B are operation explanatory diagrams of a forward / reverse switching mechanism, in which FIG. 4A shows a forward state, FIG. 4B shows a reverse state, and FIG. 4C shows a neutral state.
FIG. 5 is a skeleton diagram showing an outline of a conventional vehicle drive device.
[Explanation of symbols]
1 Vehicle drive system
2 Casing (fixing member)
3 Torque converter
4 Input shaft
10 Belt type continuously variable transmission
11 Primary axis
12 Secondary shaft
13 Primary pulley
14 Secondary pulley
15 Drive belt
20 Forward / reverse switching mechanism
23 Rotating shaft
25 pinion shaft
26 Pinion gear
28 Output shaft
28a Drive gear
28b Side gear
29 Drive gear
30 Driven gear
30a spline
30b Side gear
31 Switching means
32 hub
33 sleeve
30a spline
34a spline
34 Locking member
40 differential equipment
42 Final Gear
N Neutral position
D Advance position
R reverse position

Claims (5)

A drive belt is wound around a primary pulley with a variable pulley groove width provided on the primary shaft and a secondary pulley with a variable pulley groove width provided on the secondary shaft, and the pulley groove width of each pulley is changed to change the pulley groove width. A vehicle drive device comprising: a belt-type continuously variable transmission that changes continuously by changing the ratio of the effective winding diameter of the drive belt; a forward / reverse switching mechanism that switches forward and backward; and a differential device that transmits power to the drive wheels In
The forward / reverse switching mechanism is
A rotating shaft rotatably supported by a fixed member;
A pinion shaft disposed on the rotating shaft perpendicular to the axis of the rotating shaft;
A pinion gear rotatably supported on the pinion shaft;
An output shaft provided with a side gear that is rotatably supported by the rotating shaft and is transmitted to the differential device and meshes with the pinion gear;
A driven gear that is rotatably supported by the rotating shaft and is transmitted from the secondary shaft, and provided with a side gear that meshes with the pinion gear;
Each of a forward position where the driven gear and the rotating shaft are coupled so that power can be transmitted, a retracted position where the rotating shaft is fixed to a fixed member, a neutral position which allows rotation between the driven gear and the rotating shaft and between the rotating shaft and the fixed member. Switching means for switching to a position;
A vehicle drive device comprising: The switching means is
A spline provided in the driven gear;
A spline provided on the fixing member;
A hub provided on the rotating shaft between the driven gear and the fixed member;
A sleeve that is always splined to the hub,
The sleeve moves to a neutral position that meshes only with the hub, a forward position that meshes with the hub and the spline of the driven gear, and a retreat position that meshes with the hub and the spline of the fixed member. The vehicle drive device according to claim 1. In the forward / reverse switching mechanism of the vehicle drive device that switches the power from the engine side to forward and backward and outputs it to the differential side,
A rotating shaft rotatably supported by a fixed member;
A pinion shaft disposed perpendicular to the axis of the rotating shaft on the rotating shaft;
A pinion gear rotatably supported on the pinion shaft;
An output shaft provided with a side gear that is rotatably supported by the rotating shaft and is transmitted to the differential side and meshes with the pinion gear;
A driven gear provided with a side gear that is rotatably supported by the rotating shaft and is transmitted from the engine side and meshes with the pinion gear;
Switching means for switching between a forward position where the driven gear and the rotary shaft are coupled so that power can be transmitted and a reverse position where the rotary shaft is fixed to a fixed member;
A forward / reverse switching mechanism for a vehicle drive device. The switching means is
A forward / reverse switching mechanism for a vehicle drive device, characterized by having a neutral position that allows rotation between a driven gear and a rotating shaft that are switched by the switching means and between a rotating shaft and a fixed member. The switching means is
A spline provided in the driven gear;
A spline provided on the fixing member;
A hub provided on a rotating shaft between the driven gear and the fixed member;
A sleeve that is always splined to the hub,
The sleeve moves to a neutral position that meshes only with the hub, a forward position that meshes with the hub and the spline of the driven gear, and a retreat position that meshes with the hub and the spline of the fixed member. The forward / reverse switching mechanism of the vehicle drive device according to claim 4.

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