JP2003314662A - Vehicle driving device and forward/reverse change-over mechanism for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle driving device with simple construction for suppressing manufacturing costs, and a forward/reverse change-over mechanism. <P>SOLUTION: The forward/reverse change-over mechanism 20 comprises a rotating shaft 23 journaled to a casing 2, a pinion gear 26 journaled to a pinion shaft 25 provided in the rotating shaft 23, an output shaft 28 which has a side gear 28b journaled to the rotating shaft 23 for meshing with the pinion gear 26 and which serves for power transmission to a differential device 40, a driven gear 30 which has a side gear 30a journaled to the rotating shaft 23 for meshing with the pinion gear 26 and which meshes with a driving gear 29 provided in a primary shaft 12 of a belt continuously variable transmission 10, and changing means 31 for change-over among a forward travel position D where the driven gear 30 and the rotation shaft 23 are joined together, a reverse travel position R where the rotating shaft 23 is fixed to the casing 2 and a neutral position N. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle drive device and a forward / reverse switching mechanism for the vehicle drive device.

[0002]

2. Description of the Related Art Conventionally, a vehicle drive device using a belt type continuously variable transmission in which an engine is installed horizontally is disclosed in, for example, Japanese Patent Application Laid-Open No. 6-221386 and its skeleton diagram is shown in FIG. Further, an engine 101, a fluid coupling 102, a forward / reverse switching mechanism 105, and a belt type continuously variable transmission 110 are coaxially provided in the vehicle body width direction, and the output continuously stepped by the continuously variable transmission 110 is provided as a reduction mechanism 120. It is configured to be transmitted to the differential device 130 via the differential device 130 and distributed to the left and right wheels by the differential device 130.

Explaining the structure of each part, the forward / reverse switching mechanism 105 includes a sun gear 106a which always rotates integrally with an input shaft 103 connected to a crankshaft 101a of an engine 101 via a fluid coupling 102, and a ring gear 106b. , Mesh with each other and sun gear 1
A plurality of pinion gears 106c and 106d that mesh with the ring gear 106b and the pinion gear 106c.
A double pinion type planetary gear 106 having a carrier 106e that rotatably supports 106d is provided. A forward clutch 107 for selectively transmitting power by selectively switching between the carrier 106e and the output shaft 103 is arranged, and the ring gear 106b can be fixed to the casing 109 by a reverse brake 108.

The belt type continuously variable transmission 110 includes an input shaft 10
3, a primary shaft 111 arranged coaxially, and a secondary shaft 112 arranged in parallel with the primary shaft 111.
And these primary shaft 111 and secondary shaft 112
A primary pulley 113 and a secondary pulley 114, and a drive belt 115 wound between these pulleys 113 and 114.
By changing the pulley groove widths of the pulleys 3 and 114, the ratio of the effective winding diameter of the drive belt 115 to the pulleys 113 and 114 is changed so that the speed can be changed steplessly.

The reduction mechanism 120 is a continuously variable transmission 1
Drive gear 1 provided on ten secondary shafts 112
21 and an idler gear 1 that meshes with the drive gear 121
22 and a pinion gear 123 that meshes with a final gear 132 of the differential device 130. The idler gear 122 and the pinion gear 123 include an idler shaft 124.
Are integrally connected by and are rotatably supported by the casing 109.

The differential device 130 is a hollow differential case 1 rotatably supported by a casing 109.
31 and the reduction mechanism 12 is attached to the differential case 131.
Final gear 13 that meshes with 0 pinion gear 123
2 and the pair of pinions 134 are provided in the differential case 131 by the pinion shaft 133 whose both ends are supported by the differential case 131. The left and right side gears 135 mesh with both the pinion 134, and a joint (not shown) from both side gears 135 Power is transmitted to the left and right drive wheels via the axle shaft.

In such a structure, the forward clutch 107 provided in the forward / reverse switching mechanism 105 is engaged and the reverse brake 108 is released during forward movement. As a result, the sun gear 106a and the carrier 106d are in a state of rotating integrally, and the input shaft 10 by the engine 101 is rotated.
The rotation of 3 is transmitted to the carrier 106e of the planetary gear 106, and the input shaft 103 and the primary shaft 111 rotate integrally in the same direction. And continuously variable transmission 11
The power that is continuously variable at 0 is output to the secondary shaft 112,
It is transmitted to the differential device 130 via the reduction mechanism 120, and is distributed and transmitted to the left and right drive wheels by the differential device 130.

On the other hand, when moving backward, 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. In the planetary gear 106, the ring gear 106 is rotated while the pinions 106c and 106d meshing with each other by the sun gear 106a on the input side are reversely rotated.
b along with the carrier 106e to rotate the sun gear 106
The speed of the continuously variable transmission 11 is reduced by rotating in a direction opposite to the direction a.
The power that is continuously variable at 0 is output to the secondary shaft 112,
It is transmitted to the differential device 130 via the reduction mechanism 120, and is distributed and transmitted to the left and right drive wheels by the differential device 130.

Further, at the time of neutral, 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.

Therefore, forward / backward switching can be performed by switching the operation of the forward clutch 107 and the reverse brake 108.

[0011]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
According to Japanese Patent No. 386, 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, and forward / backward switching is performed.

However, the planetary gear 106 used in the forward / reverse switching mechanism 105 is required to have high precision, and the forward clutch 107 and the reverse brake 108 are provided, which complicates the structure. As the outer shape of 105 becomes large, a large manufacturing cost is required.

When the rotation of the drive wheels is stopped, such as when the vehicle is stopped, the continuously variable transmission 110 is driven by the drive wheels in the stopped state via the differential device 130 and the reduction mechanism 120, which are capable of transmitting power to each other. The rotation of the secondary shaft 112 is restricted. The rotation of the secondary shaft 112 due to this restraint causes the continuously variable transmission 1 to stop.
When the operation of 10 is stopped, the primary pulley 113
Also, the groove width of the secondary pulley 114 cannot be controlled, and the gear ratio cannot be controlled when the vehicle is stopped. As a result, for example, if the vehicle stops in a state where the continuously variable transmission 110 is not sufficiently gearshift controlled to the maximum gear ratio side (LOW side), the gear ratio at the time of the stop is maintained and the gear shift is performed at the next vehicle start. It may start from the ratio state, which may affect the smooth start of the vehicle. This is particularly noticeable when the vehicle is repeatedly moved forward and backward, such as garage parking and parallel parking.

Therefore, a first object of the present invention made in view of the above point is to reduce the manufacturing cost by simplifying the structure and to control the shift of the belt type transmission when the vehicle is stopped. To provide a device.

A second object of the present invention is to provide a forward / reverse switching mechanism for a vehicle drive device which can reduce manufacturing cost by simplifying the structure.

[0016]

According to another aspect of the present invention, there is provided a vehicle drive device, wherein a primary shaft provided on a primary shaft and having a variable pulley groove width, and a secondary shaft provided on the secondary shaft. The drive belt is wound around the secondary pulley with a variable pulley groove width, and the pulley groove width of each pulley is changed to change the ratio of the effective winding diameter of the drive belt to each pulley, and the speed is changed steplessly. In a vehicle drive device including a gear transmission, a forward / reverse switching mechanism for switching between forward and backward movements, and a differential device for transmitting power to drive wheels, the forward / backward switching mechanism is a rotation member rotatably supported by a fixed member. An axis, a pinion shaft arranged on the rotary shaft orthogonal to the axis of the rotary shaft, a pinion gear rotatably supported on the pinion shaft, and a rotary shaft mounted on the rotary shaft. An output shaft that is freely rotatably supported and transmitted to the differential device and is provided with a side gear that meshes with the pinion gear; and an output shaft that is rotatably rotatably supported by the rotation shaft and transmitted from the secondary shaft and meshes with the pinion gear. A driven gear provided with a side gear, a forward position for connecting the driven gear and the rotary shaft in a power-transmittable manner, a retracted position for fixing the rotary shaft to a fixed member, and between the driven gear and the rotary shaft and between the rotary shaft and the fixed member. And a switching means for switching to a neutral position that allows rotation.

According to the first aspect of the present invention, in the forward-reverse switching mechanism, the pinion gear is provided on the pinion shaft provided on the rotary shaft axially supported by the fixed member, and the output shaft is provided with the side gear that meshes with the pinion gear. Rotatably provided, 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 a forward state in which the driven gear and the rotary shaft are rotatably coupled by the switching means and the rotary shaft Can be formed by a relatively simple configuration that switches the retracted state in which the drive gear is coupled to the fixed member and the neutral state in which both the driven gear and the rotary shaft and the coupling between the rotary shaft and the fixed member are released, and the conventional planetary gear that requires high precision Compared to the forward / reverse switching mechanism used, required accuracy of each component and assembly of the component Required accuracy can be greatly relaxed, it can be expected drastically reduce manufacturing cost.

Further, for example, when switching from the forward drive position to the reverse drive position or from the reverse drive position to the forward drive position, switching from the forward drive position or the reverse drive position to the neutral position allows the driven gear to idle with respect to the output shaft, It is possible to perform control to shift the continuously variable transmission to the maximum gear ratio side in the stopped state, and to ensure smooth reverse or forward start from the state in which the gear shift control is performed to the maximum gear ratio side.

According to a second aspect of the present invention, in the vehicle drive system according to the first aspect, the switching means is a spline provided on the driven gear, a spline provided on the fixing member, the driven gear and the spline. A hub provided on the rotating shaft between the fixing member and a sleeve that is always spline-fitted to the hub are provided, and the sleeve is provided both at the neutral position where the hub meshes only with the hub and at the spline of the hub and the driven gear. It is characterized in that it moves to each position of an engaged forward position and a retracted position where both the hub and the spline of the fixing member engage with each other.

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 have a simple structure and are compact. The switching means can be formed in the.

The invention of a forward / reverse switching mechanism for a vehicle drive device according to a third aspect of the present invention, which achieves the second object, is a vehicle drive device for switching power from an engine side to a forward / backward direction and outputting the power to a differential side. In the forward / reverse switching mechanism of
A rotating shaft rotatably supported by a fixed member, a pinion shaft arranged on the rotating shaft orthogonal to the axis of the rotating shaft, a pinion gear rotatably supported on the pinion shaft, and the rotating shaft. An output shaft that is rotatably supported by a shaft and is transmitted to the differential side and that is provided with a side gear that meshes with the pinion gear; and an output shaft that is rotatably supported by the rotation shaft and is transmitted from the engine side and to the pinion gear. A driven gear provided with a meshing side gear, a switching means for switching the driven gear to a forward position for connecting the rotary shaft so that power can be transmitted, and a retracting position for fixing the rotary shaft to a fixed member. To do.

According to the third aspect of the present invention, in the forward / reverse switching mechanism, the pinion gear is provided on the pinion shaft provided on the rotary shaft pivotally supported by the fixed member, and the output shaft is provided with the side gear that meshes with the pinion gear on the rotary shaft. And a driven gear having a side gear that is transmitted from the engine side and meshes with the pinion gear, is rotatably arranged on the rotating shaft, and the switching gear connects the driven gear and the rotating shaft so that power can be transmitted, and the rotating shaft. It is formed with a relatively simple structure that switches to a retracted state in which the gear is connected to a fixed member, and compared with the conventional forward / reverse switching mechanism using a planetary gear that requires high precision, the required accuracy of each component and the assembly of the component The required accuracy can be greatly eased, and a significant reduction in manufacturing cost can be expected.

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 provided between the driven gear and the rotary shaft and between the rotary shaft and the fixed member which are switched by the switching means. It is characterized by having a neutral position that allows rotation between.

According to the invention of claim 4, by providing the neutral position in claim 3, the usability can be improved.

According to a fifth aspect of the present invention, in the forward-reverse switching mechanism of the vehicle drive system according to the fourth aspect, the switching means includes a spline provided on the driven gear and a spline provided on the fixing member. A hub provided on the rotary shaft between the driven gear and the fixed member, and a sleeve that is always spline-fitted to the hub, the sleeve being a neutral position that meshes only with the hub,
It is characterized by moving to each of a forward position where the hub and the spline of the driven gear mesh with each other and a retracted position where the hub and the spline of the fixing member mesh with each other.

According to the fifth aspect of the present invention, the spline formed on the driven gear, the spline provided on the fixed member, the hub provided on the rotary shaft, and the sleeve selectively engaged with these have a simple structure and are compact. Input means can be formed in the.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a vehicle drive device and a forward / reverse switching mechanism of the vehicle drive device according to the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 is a skeleton diagram showing an overall outline of the vehicle drive device 1. The vehicle drive device 1 includes an engine (not shown), a torque converter or a fluid coupling housed in a casing 2 that is a fixed member, a torque converter 3, a starting clutch 7, and a belt type continuously variable transmission 10 in the present embodiment. The output from the secondary shaft 12 of the continuously variable transmission 10 provided coaxially in the vehicle width direction is transmitted to the differential device 40 via the forward / reverse switching mechanism 20 having a reduction function, and the differential device 40
Is configured to be distributed to the left and right wheels.

Explaining the structure of each part, the torque converter 3 includes an input shaft 4 arranged coaxially with the crankshaft of the engine, an impeller 5 connected to the crankshaft of the engine, and an input shaft 4 facing the impeller 5. Has a turbine 6 coupled to the impeller 5 by rotation of the impeller 5
The oil in the inside is discharged to the outside by the centrifugal force, and the oil flows in from the outside of the turbine 6 to transmit the torque in the same direction as the rotation of the impeller 5 to the turbine 6, so that the input shaft 4 coupled to the turbine 6 is released. Drive to rotate.

The continuously variable transmission 10 is arranged coaxially with the input shaft 4 and is connected to the input shaft 4 through a starting clutch 7, and a primary shaft 11 is arranged in parallel with the primary shaft 11 to continuously change the speed. Secondary shaft 12 that is the output shaft of the machine 10
And a primary pulley 13 and a secondary pulley 14 respectively provided on the primary shaft 11 and the secondary shaft 12, and a drive belt 15 wound between the pulleys 13 and 14. Then, the hydraulic actuator 16 provided on the primary pulley 13 and the hydraulic actuator 17 provided on the secondary pulley 14
By the primary pulley 13 and the secondary pulley 1
The drive belt 1 for the primary pulley 13 and the secondary pulley 14 is changed by changing each pulley groove width of No. 4
It is configured to change the ratio of the effective winding diameter of No. 5 infinitely variable.

That is, at the time of upshifting, the pulley groove width of the primary pulley 13 is reduced to reduce the primary pulley 13
While increasing the effective winding diameter of the drive belt 15 relative to the secondary pulley 14 and increasing the pulley groove width of the secondary pulley 14 to reduce the effective winding diameter of the drive belt 15 around the secondary pulley 14, the gear ratio maximum side (LOW
From the side) to the minimum gear ratio side (OD side). On the other hand, during 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. The shift control from the OD side to the LOW side is performed by.

The forward / reverse switching mechanism 20 is arranged in parallel with the secondary shaft 12 and has both ends respectively as shown in FIG. 1 and FIG. 2 which are sectional views of a main part and in FIG. 3 which is an enlarged view of a portion A of FIG. It has a rotary shaft 23 rotatably supported by the casing 2 via bearings 21 and 22, and one end of the rotary shaft 23 is open at the shaft end and a lubricating oil supply hole 24 is bored along the shaft center. At the same time, a pinion shaft 25 is disposed at a substantially central portion in the length direction of the rotating shaft 23 so as to penetrate the rotating shaft 23 at right angles to the axis. Rotating shaft 2
At both ends of the pinion shaft 25 protruding from
Pinion gears 26, which are fitted to the respective pinion fitting portions 23a recessed in a spherical shape at 3, and are prevented from coming off by clips 27, are rotatably supported.

An output shaft 28 having a drive gear 28a which meshes with a final gear 42 of a differential device 40 and a side gear 28b which meshes with each pinion gear 26 is rotatably supported by the rotary shaft 23 with a pinion gear 26 interposed therebetween. , A continuously variable transmission 10, a driven gear 30 formed with a side gear 30b that meshes with a drive gear 29 provided on the secondary shaft 12 and meshes with each pinion gear 26 is rotatably supported, and is switched between the driven gear 30 and the casing 2. Means 31 are arranged.

A lubricating oil supply hole 24 formed in the rotary shaft 23
Is a sliding portion between the rotary shaft 23 and the output shaft 28, a sliding portion between the pinion fitting portion 23a and the pinion gear 26, and the rotary shaft 23 and the driven gear 30 via the lubricating oil ejection holes 24a, 24b, 24c and the like. Lubricating oil supply hole 24 communicating with the sliding part
Is supplied to the portion.

The switching means 31 is provided on the driven gear 30 and a hub 32 provided between the driven gear 30 and the bearing 22 by spline fitting on the rotary shaft 23, a sleeve 33 which is always spline fitted on the hub 32. It is formed by a spline 30a and a locking member 34 attached to the casing 2 with a mounting bolt 35 in the shape of a ring having a spline 34a formed coaxially with the rotary shaft 23. Here, the sleeve 33 includes a neutral position N that meshes only with the hub 32, the hub 32, and the driven gear 3.
A forward position D that meshes with the 0 spline 30a,
It is configured to be movable in the extending direction of the rotary shaft 23 between a retracted position R in which the hub 32 and the spline 34a of the locking member 34 are both engaged. The switching operation of the sleeve 33 to each of the neutral position N, the forward movement position D, and the backward movement position N is performed by an actuator such as an electric motor, a hydraulic cylinder mechanism, a pneumatic cylinder mechanism.

When the sleeve 33 is in the forward position D,
The driven gear 30 and the rotary shaft 23 are coupled via a sleeve 33 and a hub 32 so that power can be transmitted, and the continuously variable transmission 10
The power transmitted from the drive gear 29 provided on the secondary shaft 12 to the driven gear 30 is transmitted from the driven gear 30 through the sleeve 33 and the hub 32 as shown in the thick line in FIG. Transmitted to 23,
It is transmitted from the rotary shaft 23 to the output shaft 28 via the pinion shaft 25 and the pinion gear 26, and the driven gear 30
Is transmitted to the output shaft 28 through the pinion 26, the driven gear 30, the rotary shaft 23, and the output shaft 28 rotate integrally, and the drive gear 28a of the output shaft 28 that rotates integrally in the same direction as the driven gear 30 causes the differential. It is transmitted to the final gear 42 of the device 40. At this time, the drive gear 29, the driven gear 30, the drive gear 2
The final gear 42 is decelerated according to the gear specifications of 8a.
Is transmitted to.

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 by the locking member 34 via the hub 32 and the sleeve 33 to be attached to the housing 2. Fixed. The power input to the driven gear 30 from the drive gear 29 provided on the secondary shaft 12 rotationally drives the pinion gear 26 that meshes with the side gear 30b of the driven gear 30 as shown by the thick line in the power transmission system path in FIG.
The output shaft 28 meshed with the side gear 28b is rotationally driven in the opposite direction to the driven gear 30 via the pinion gear 26. Then, it is transmitted to the final gear 42 of the differential device 40 by the drive gear 28a of the output shaft 28. At this time, the drive gear 29, the driven gear 30,
The drive gear 28 a, the side gear 30 b of the driven gear 30, the side gear 28 b of the output shaft 28, etc. are decelerated according to the gear specifications, and the power is transmitted to the final gear 42.

Further, the sleeve 33 has a neutral position N.
4, the power input from the drive gear 29 provided on the secondary shaft 12 to the driven gear 30 is as shown in FIG.
Even if the driven gear 30 rotates, the rotary shaft 24 and the pinion gear 26 idle and the power is not transmitted thereafter, as indicated by a thick line in (c).

The differential device 40 has a hollow differential case 41 rotatably supported by the casing 2, and the differential case 41 has an output shaft 28 of the forward / reverse switching device 20.
A final gear 42 that meshes with the drive gear 28a formed in the differential gear 41 is provided, and a pair of pinions 44 are provided in the differential case 41 by a pinion shaft 43 whose both ends are supported by the differential case 41. 45 are meshed with each other, and power is transmitted from both side gears 45 to the left and right drive wheels via a joint and an axle shaft (not shown).

Next, the operation of the vehicle drive device 1 thus constructed will be described.

When the vehicle is moving forward, the starting clutch 7 is in the engaged state, and the sleeve 33 of the switching means 31 of the forward / reverse switching mechanism 20.
Is set to the forward drive position D in which the hub 32 and the spline 30a of the driven gear 30 mesh with each other. As a result, the primary shaft 11 of the continuously variable transmission 10 is rotationally driven in the same direction as the engine by the engine via the torque converter 3 and the starting clutch 7. Then, the power continuously variable-shifted 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 meshing with the drive gear 29 provided on the secondary shaft 12 is rotationally driven.

In the forward / reverse switching mechanism 20 in which the driven gear 30 is rotationally driven, the sleeve 33 is in the forward drive position D, and the driven gear 30 and the rotary shaft 23 are in the sleeve 33 and the hub 3.
The drive gear 29 is connected to the drive gear 29 via the drive gear 29.
The power input from the driven gear 30 to the rotary shaft 23 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 are integrally formed. The final gear 42 of the differential device 40 is rotationally driven by the drive gear 28a of the output shaft 28 that rotates and 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.

To switch from this forward state to, for example, reverse, the vehicle is stopped and the sleeve 33 of the switching means 31 provided in the forward / reverse switching mechanism 20 is moved from the forward position D to the neutral position N to the reverse position R. Is done by doing.

At the time of this switching, the sleeve 33 is switched from the forward drive position D to the neutral position N, so that the connection 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. 30 becomes idle to the output shaft 28, and the secondary shaft 12 of the continuously variable transmission 10 provided with the drive gear 29 meshing with the driven gear 30 is maintained in a rotatable state. Here, the continuously variable transmission 10 is LOW.
When the shift control to the side is not sufficiently performed, the engagement state of the starting clutch 7 is continuously maintained, the primary shaft 11 is continuously driven to rotate by the engine, and the continuously variable transmission 10 is moved to the LOW side. After the shift control is performed, the engagement of the starting clutch 7 is released.

Thereafter, from the neutral position N where the sleeve 33 is fitted only on the hub 32, the hub 32 and the locking member 3 are released.
4 to the retracted position R which engages with the spline 34a. By switching the sleeve 33 to the retracted position R, the power transmission between the driven gear 30 of the forward / reverse switching mechanism 20 and the rotary shaft 23 is released, and the rotary shaft 23 is locked by the locking member 3.
It is fixed to 2, and the starting clutch 7 is engaged.

As a result, the primary shaft 11 of the continuously variable transmission 10 is rotationally driven by the engine in the same direction as the engine via the torque converter 3 and the starting clutch 7. Then, the power that is continuously changed 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.

The power input to the driven gear 30 is applied to the side gear 30b of the driven gear 30 and the pinion gear 26.
The output shaft 28 in which the side gear 28b meshing with the drive gear 28a is rotationally driven in the opposite direction to the driven gear 30, and the final gear 42 of the differential device 40 is rotationally driven by the drive gear 28a. Then, power is transmitted from the differential device 40 to the left and right drive wheels to start backward movement. Since the continuously variable transmission 10 is previously controlled to shift to the LOW side when the vehicle is started to move backward, it is possible to smoothly start from the state in which the shift is controlled to the LOW side.

Further, switching from the backward state to the forward direction is performed by
This 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 backward position R to the neutral position N to the forward position D.

At the time of this switching, the sleeve 33 is switched from the retracted position R to the neutral position N, so that the sleeve 33 is moved to the spline 34a of the locking member 34 and the hub 32.
When the driven gear 30 is engaged with the hub 32, the driven gear 30 is allowed to idle with respect to the output shaft 28 via the pinion gear 26 and the like, and the drive gear 29 meshing with the driven gear 30 is provided. The secondary shaft 12 of the continuously variable transmission 10 is maintained in a rotatable state, and when the continuously variable transmission 10 does not perform sufficient shift control to the LOW side, the engagement state of the starting clutch 7 continues continuously. While being maintained and the primary shaft 11 continues to be driven to rotate, the continuously variable transmission 10 is shift-controlled to the LOW side, and a smooth forward start from the state where the shift control is performed to the LOW side can be ensured.

As a result, the continuously variable transmission 10 is set to the LO position when the vehicle is parked in parallel such that the vehicle is repeatedly moved forward and backward, when the vehicle is parked, and when the vehicle is started after parking.
It is performed from the state where the shift control is performed to the W side, and smooth start of the vehicle is started to obtain maneuverability and maneuverability.

Further, in the forward / reverse switching mechanism 20, the pinion shaft 25 provided on the rotary shaft 23 rotatably supported by the casing 2 is provided with the pinion gear 26, and the rotary shaft 23 is meshed with the final gear 42 of the differential device 40. The drive gear 28a and the output shaft 28 having a side gear 28b meshing with each pinion gear 26 are rotatably provided, and the driven gear 30 is provided with a side gear 30b meshing with the drive gear 29 provided on the secondary shaft 12 and meshing with each pinion gear 26. The configuration in which the rotatably arranged on the rotary shaft 23 greatly reduces the required accuracy of each component and the assembly precision of the component as compared with the conventional forward / reverse switching mechanism using a planetary gear that requires high precision. it can. Further, the switching means 31 is in an advanced state in which the driven gear 30 and the rotary shaft 23 are coupled to each other so that power can be transmitted, a retracted state in which the rotary shaft 23 is coupled to the casing 2, and a driven gear 30, the rotary shaft 23, the rotary shaft 23, and the casing 2. It is formed with a relatively simple structure that switches to a neutral state in which both of the couplings are released, and a significant reduction in manufacturing cost can be expected.

Further, the switching means 31 has a hub 32 provided on the rotary shaft 23, a sleeve 33 meshing with the hub 32,
The spline 30a of the driven gear 30 and the spline 3
4a is formed by the locking member 34, etc., and is greatly simplified and compact as compared with the conventional forward / reverse switching mechanism by switching the operation by the forward clutch and the reverse brake formed by the multi-disc clutch or the multi-disc brake. It is possible to reduce the manufacturing cost.

Further, in contrast to a conventional drive device in which a torque converter, a forward / reverse switching mechanism, and a continuously variable transmission are arranged coaxially with a crankshaft of a horizontally arranged engine, a torque converter and a continuously variable transmission are provided between the torque converter and the continuously variable transmission. Can be shortened, the overall length of the drive unit in the vehicle width direction can be shortened, the drive unit can be made compact, and it is expected that the vehicle can be installed in the engine room and the workability in the engine room can be improved. .

[0054]

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 a pinion gear provided on a pinion shaft provided on a rotary shaft pivotally supported by a fixed member to rotate the pinion gear. An output shaft having a side gear that meshes with a pinion gear is rotatably provided on the shaft, and a driven gear having a side gear that is transmitted by a secondary shaft and meshes with the pinion gear is rotatably arranged on the rotary shaft. Is formed in a relatively simple configuration that switches between a forward state in which the power transmission is possible, a backward state in which the rotary shaft is coupled to the casing, and a neutral state in which the driven gear and the rotary shaft and the rotary shaft and the fixed member are both released from the neutral state. Therefore, compared to the conventional forward / reverse switching mechanism that uses planetary gears that require high precision, Required accuracy of assembly of the required accuracy and components of the members can be greatly relaxed, it can be expected to reduce the significant production cost.

Also, for example, when switching from the forward drive state to the reverse drive state or from the reverse drive state to the forward drive state, the driven gear is switched to the neutral state so that the driven gear can idle with respect to the output shaft, and continuously variable transmission in the stopped state. The machine can be controlled to shift to the LOW side, and it is possible to ensure smooth reverse or forward starting from the state in which the shift is controlled to the LOW side.

[Brief description of 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 sectional view of an essential part of a forward / reverse switching mechanism.

FIG. 3 is an enlarged view of part A in FIG.

FIG. 4 is an operation explanatory view of the forward / reverse switching mechanism, (a) showing a forward movement state, (b) showing a backward movement state, and (c) showing a neutral state.

FIG. 5 is a skeleton diagram showing an outline of a conventional vehicle drive device.

[Explanation of symbols]

1 Vehicle drive 2 Casing (fixing member) 3 Torque converter 4 input axes 10 Belt type continuously variable transmission 11 primary axis 12 Secondary axis 13 Primary pulley 14 Secondary pulley 15 Drive belt 20 Forward / reverse switching mechanism 23 rotation axis 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 hubs 33 Sleeve 30a spline 34a spline 34 Locking member 40 differential device 42 Final Gear N neutral position D Forward position R retracted position

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3J028 EA09 EB10 EB16 EB23 EB35                       EB37 EB44 EB54 EB62 EB67                       FA06 FB06 FC07 FC23 FC64                       GA02                 3J062 AA18 AB01 AB06 AB12 AB34                       AC03 BA11 BA14 BA35 CG03                       CG14 CG32 CG37 CG44 CG82

Claims (5)

[Claims] 1. A drive belt is wound around 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 to change the pulley groove width of each pulley. It is equipped with a belt-type continuously variable transmission that changes the ratio of the effective winding diameter of the drive belt to each pulley to achieve stepless speed change, a forward-reverse switching mechanism that switches between forward and reverse, and a differential device that transmits power to the drive wheels. In the vehicle drive device, the forward-reverse switching mechanism includes a rotating shaft rotatably supported by a fixed member, a pinion shaft arranged on the rotating shaft orthogonal to an axis of the rotating shaft, and the pinion. A pinion gear that is rotatably supported by a shaft, and a pinion gear that is rotatably supported by the rotating shaft and is transmitted to the differential device. An output shaft provided with a side gear that meshes with the driven shaft, a driven gear that is rotatably supported by the rotary shaft, is transmitted from the secondary shaft, and is provided with a side gear that meshes with the pinion gear, and powers the driven gear and the rotary shaft. A forward position that is communicatively coupled, a backward position that fixes the rotary shaft to a fixed member, and a switching unit that switches to a neutral position that allows rotation between the driven gear and the rotary shaft and between the rotary shaft and the fixed member, A drive device for a vehicle, comprising: 2. The switching means comprises a spline provided on the driven gear, a spline provided on the fixed member, a hub provided on the rotary shaft between the driven gear and the fixed member, The hub is provided with a sleeve that is always fitted with a spline, and the sleeve is 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 backward position that meshes with the spline of the hub and the fixing member. The vehicle drive device according to claim 1, wherein the vehicle drive device moves to each position. 3. A forward / reverse switching mechanism of a vehicle drive device for switching the power from the engine side to the forward / rearward direction and outputting the power to the differential side, the rotary shaft being rotatably supported by a fixed member, and the rotary shaft being rotated by the rotary shaft. A pinion shaft arranged orthogonally to the axis of the shaft, a pinion gear rotatably supported by the pinion shaft, and a pinion gear rotatably supported by the rotary shaft and transmitted to the differential side and the pinion gear. An output shaft provided with a meshing side gear, a driven gear rotatably supported by the rotating shaft and transmitted from the engine side, and a side gear provided with the pinion gear, and power transmission between the driven gear and the rotating shaft. And a switching means for switching to each of a forward position where the rotary shaft is fixed to the fixed member and a backward position where the rotary shaft is fixed to the fixed member. Reverse switching mechanism of the vehicle drive device according to claim and. 4. The front and rear of a vehicle drive device, wherein the switching means has a neutral position that allows rotation between the driven gear and the rotating shaft and between the rotating shaft and the fixed member that are switched by the switching means. Progressive switching mechanism. 5. The switching means includes a spline provided on the driven gear, a spline provided on the fixed member, a hub provided on a rotary shaft between the driven gear and the fixed member, and the hub. A sleeve that is always spline-fitted to the hub, the sleeve is 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 retracted position that meshes with the spline of the hub and the fixing member. 5. The forward / reverse switching mechanism of the vehicle drive device according to claim 4, wherein the forward / reverse switching mechanism is moved to each position.