JPH05124446A - Power train structure of vehicle - Google Patents

Abstract

PURPOSE:To form the power train structure of a vehicle in a compact state, in power train structure wherein a belt type continuously variable transmission is arranged to a transverse engine longitudinally of a car body. CONSTITUTION:A crank shaft 3e of an engine 3 is arranged in the direction of the width of a car and a starting device 10, such as a torque converter, is arranged to the end part of a crank shaft 3e. Further, a continuously variable transmission 20 is arranged in the rear of the engine 3. A support shaft 22a of a drive pulley 22 of the continuously variable transmission 20 and a support shaft 23a for a driven pulley 23 are arranged both in parallel to the crank shaft 3e. A forward reverse shifting device 15 is arranged in the rear of the car body of the starting device 10. This constitution causes shortening of the length, in the direction of the width of a car, of a power train. Further, the drive pulley 22 of the continuously variable transmission 20 is arranged on a drive shaft 21, resulting in simplification of constitution. In addition, a reduction gear 30 is arranged on shafts 23a and 31 different from the drive shaft 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a power train structure of a vehicle, and more particularly to an improvement of a speed change mechanism including a drive pulley, a driven pulley and a belt type continuously variable speed change mechanism having a belt wound around these pulleys. ..

[0002]

2. Description of the Related Art Conventionally, as a powertrain structure for a vehicle of this type, for example, as disclosed in Japanese Utility Model Publication No. 64-6440, the engine is placed horizontally so that its crankshaft is located in the vehicle width direction. A torque converter is connected to the end of the crankshaft of the engine, and the output shaft of the torque converter is arranged in a straight line following the crankshaft, and a belt type continuously variable transmission is arranged with respect to the converter output shaft. While the drive pulley of the machine is arranged, the driven pulley of the continuously variable transmission is arranged on the rear side of the vehicle body of the drive pulley, and the support shaft of the driven pulley is provided coaxially on the drive shaft of the front wheel. Are known.

Further, Japanese Patent Laid-Open No. 64-69854 discloses that in an automatic two-wheeled vehicle or three-wheeled vehicle, the engine is arranged horizontally in the vehicle width direction as described above, and the engine is driven to the rear side of the vehicle body. It is disclosed that a pulley and a driven pulley are arranged, and both the support shaft of the drive pulley and the support shaft of the driven pulley are arranged parallel to the crankshaft of the engine.

[0004]

By the way, in the case of applying the structure in which the engine and the continuously variable transmission mechanism are arranged in parallel in the longitudinal direction of the vehicle body as in the latter publication to a four-wheel vehicle, the drive pulley of the continuously variable transmission mechanism and By disposing one of the driven pulleys on the drive shaft of the front wheels as in the former publication, the power train structure can be made compact. Further, in a vehicle equipped with a continuously variable transmission, a forward / reverse switching device for selectively switching the traveling direction of the vehicle between front and rear is arranged. In the case of further arranging it to the side, the power train structure becomes long in the vehicle width direction by the amount of the forward / reverse switching device. Therefore, in order to achieve compactness, the position of the forward / reverse switching device should be set appropriately. There is a need to consider. Further, in the continuously variable transmission mechanism, since the variation width of the gear ratio is limited to a relatively small width due to its structure, it is necessary to separately provide a speed reducer for changing the gear ratio. It will be necessary to consider it appropriately.

The present invention has been made in view of the above problems, and an object thereof is to provide a continuously variable engine and a belt type continuously variable transmission mechanism in parallel in the longitudinal direction of the vehicle body as described above. One of the drive pulley and the driven pulley of the speed change mechanism,
By arranging the forward / reverse switching device and the speed reducer at appropriate positions, the power train structure can be made compact.

[0006]

In order to achieve the above object, a concrete solving means of the invention according to claim 1 is an engine in which an output shaft is positioned in a vehicle width direction in an engine room, and A power train structure of a vehicle in which a belt type continuously variable transmission mechanism, which is located in a longitudinal direction of an engine body and in which a support shaft of a drive pulley and a support shaft of a driven pulley are located in parallel with an output shaft of the engine, is arranged. To do. The drive shaft of the front wheels is passed through the support shaft of the drive pulley of the continuously variable transmission mechanism, and the power transmission mechanism for transmitting power from the engine to the continuously variable transmission mechanism in the longitudinal direction of the vehicle body and the continuously variable transmission mechanism. The forward / reverse switching device is arranged between the drive pulley and the drive pulley.

According to the second aspect of the invention, the arrangement position of the forward / reverse switching device of the first aspect of the invention is limited,
First, a starting device such as a torque converter is arranged at one end of the crankshaft of the engine, and a forward / reverse switching device is arranged in the vehicle longitudinal direction of the starting device.

Further, in the invention described in claim 3, in the same manner as the invention described in claim 1, the drive shaft of the front wheel is passed through the support shaft of the drive pulley of the continuously variable transmission mechanism, and A speed reducer for decelerating the power transmitted to the driven pulley of the continuously variable transmission and transmitting it differentially is arranged on a shaft different from the drive shaft of the front wheels.

In addition, in the invention described in claim 4, the invention described in claim 1 and the invention described in claim 3 are combined.

[0010]

With the above construction, in the invention of claim 1,
Since the forward / reverse switching device having a relatively large diameter is located in the vehicle front-rear direction with respect to the engine, the vehicle width direction of the powertrain structure is shortened as compared with the case where the forward / reverse switching device is arranged on the side of the engine. It

Moreover, since the drive pulley of the continuously variable transmission is arranged on the drive shaft of the front wheels, the power train structure can be simplified and compared with the case where the drive pulley is arranged on a separately provided shaft. Can be made compact.

In particular, according to the second aspect of the invention, when a starting device such as a torque converter is connected to the engine side part, a vacant space is formed in the vehicle front-rear direction of the starting device. Since the progression switching device is arranged, the power train structure can be made compact by effectively utilizing the empty space.

According to the invention of claim 3, the drive pulley of the continuously variable transmission is arranged on the drive shaft of the front wheels, and when the reduction gear transmission is further arranged on the drive shaft of the front wheels, the drive pulley of the continuously variable transmission mechanism is arranged. As a result, the power train becomes longer in the vehicle width direction, which may make it impossible to dispose the drive pulley or the reduction gear between the two constant velocity joints provided on the drive shaft of the front wheels. Since it is arranged on a shaft provided separately from the drive shaft, the power train can be shortened in the vehicle width direction, and the front wheels can be easily arranged on the drive shaft.

Further, in the invention of claim 4, as a combined effect of the inventions of claim 1 and claim 3, the large-diameter forward / reverse switching device is located in the longitudinal direction of the engine, Since the train structure is shortened in the vehicle width direction and the reduction gear is placed on an axis that is separate from the drive shaft for the front wheels, the power train can be shortened in the vehicle width direction and the front wheel drive There is an effect that it can be easily arranged on the shaft.

[0015]

As described above, according to the vehicle powertrain structure of the invention of claim 1, when the transverse engine and the belt type continuously variable transmission mechanism are arranged side by side in the longitudinal direction of the vehicle body, Since the forward-reverse switching device is arranged in the longitudinal direction of the engine body and the drive pulley of the continuously variable transmission is arranged on the drive shaft of the front wheels, the length of the entire power train in the vehicle width direction can be shortened and the entire power train can be reduced. Can be made compact.

In particular, according to the second aspect of the invention, since the forward / reverse switching device is arranged in the empty space in the front-rear direction of the vehicle body of the starting device connected to the end of the engine, the empty space of the power train is effectively utilized to reduce power consumption. The train can be made more compact.

According to the third aspect of the invention, since the reduction gear transmission is arranged on the shaft provided separately from the drive shaft of the front wheels, the power of the portion corresponding to the drive shaft of the front wheels is correspondingly increased. The length of the train in the vehicle width direction can be shortened.

In addition, in the invention described in claim 4, the drive pulley of the continuously variable transmission is arranged on the drive shaft of the front wheels, and the forward / reverse switching device is arranged in the longitudinal direction of the engine body, and further the reduction device is provided. Since it is arranged on a shaft that is provided separately from the drive shaft of the front wheels, the length of the power train in the vehicle width direction can be more effectively shortened and the entire power train can be made compact.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show the overall structure of a powertrain structure of a vehicle for driving front wheels of an engine. In each of the drawings, 1 is a hood at the front of the vehicle, 2 is an engine room formed below the hood 1, and 3 is a four-cylinder engine that is inclined rearward in the engine room 2. The engine 3 has four cylinders 3a to 3d arranged laterally in the vehicle width direction with the cylinder row direction being positioned in the vehicle width direction, and an intake pipe 4 connected to the front side of the vehicle body for communication. An exhaust pipe 5 is communicatively connected to the rear side.

In the crankshaft (output shaft) 3e arranged in the vehicle width direction of the engine 3, a torque converter 10 as a starting device is connected and arranged at the right end portion in FIG. A belt type continuously variable transmission mechanism 20 is arranged at the rear.

The belt type continuously variable transmission mechanism 20 includes a drive pulley 22, a driven pulley 23 disposed above the drive pulley 22, and a belt 2 wound between the pulleys.
4, the support shaft 22a of the drive pulley 22 and the support shaft 23a of the driven pulley 23 are both arranged in parallel with the crankshaft 3e of the engine 3, and the engine 3 and the continuously variable transmission mechanism 20 are mounted on the vehicle body. They are arranged in parallel in the front-back direction.

Then, the drive shaft 21 of the front wheel extending in the vehicle width direction penetrates the support shaft 22a of the drive pulley 22 of the continuously variable transmission mechanism 20, and the drive pulley 22 is attached to the drive shaft 21 of the front wheel. It is arranged.

A driven sprocket 25 rotatably disposed on the drive shaft 21 of the front wheels is disposed on the right side of the support shaft 22a of the drive pulley 22 in the figure, and the output shaft 10a of the torque converter 10 is also disposed. A drive sprocket 26 is fixedly connected to the two sprocket 2
A chain 27 is wound between the Nos. 5 and 26. Therefore, the sprocket 25, 26 and the chain 27 constitute a power transmission mechanism 28 configured to further transmit the power transmitted from the engine 3 to the torque converter 10 to the rear of the vehicle body.

The front wheel drive shaft 21
In the above, between the driven sprocket 25 of the power transmission mechanism 28 and the drive pulley 22 of the continuously variable transmission mechanism 20, the forward / reverse switching device 15 is arranged at a site located in the empty space behind the vehicle body of the torque converter 10. There is.

The forward / reverse switching device 15 comprises a double pinion type planetary gear device, and a sun gear 15a connected to the driven sprocket 25 of the power transmission mechanism 28,
Inner pinion gear 15b meshing with the sun gear 15a
An outer pinion gear 15c that meshes with the inner pinion gear 15b, a ring gear 15d that meshes with the outer pinion gear 15c, and the both pinion gears 15b and 15c.
And a carrier 15e for supporting the carrier.
Is the support shaft 22 of the drive pulley 22 of the continuously variable transmission mechanism 20.
connected to a. Further, the forward / reverse switching device 15 includes
A forward clutch 17 that connects and disconnects the sun gear 15a and the carrier 15e, and a reverse clutch 18 that fixes the ring gear 15d are provided. Then, the power transmitted to the driven sprocket 25 when the forward clutch 17 is engaged is directly transmitted to the drive pulley 22 of the continuously variable transmission mechanism 20, while the inner and outer pinion gears 15 are engaged when the reverse clutch 17 is engaged.
The rotation direction is reversed by b and 15c, the speed is reduced, and the power is transmitted to the drive pulley 22.

Further, as shown in FIG. 2, the continuously variable transmission mechanism 2
The support shaft 23a of the driven pulley 23 of
Is positioned above the support shaft 22a and slightly higher than the crankshaft 3e of the engine 3.

Further, as shown in FIG. 1, the continuously variable transmission mechanism 2
On the left side of 0 in the figure, that is, on the side opposite to the forward / reverse switching device 15 side, a reduction device 30 for decelerating and transmitting power is arranged.

The speed reducer 30 is of a two-axis type, and has a drive gear 30a fixedly connected to a portion of the driven pulley 23 where the support shaft 23a extends leftward in FIG. 1, and the drive gear 30a. Also has a driven gear 30b which has a large diameter and which meshes with the drive gear 30a. Support shaft 3 for the driven gear 30b
1 is a support shaft 23 of the driven pulley 23, as shown in FIG.
It is arranged at the rear of the vehicle body of a and at a height position slightly lower than the axial center of the crankshaft 3e of the engine 3. In addition, the reduction gear transmission 30 meshes with the output gear 30c arranged at the right end of FIG. 1 of the support shaft 31 which is separately provided, and meshes with the output gear 30c, so that the position of the continuously variable transmission mechanism 20 of the drive shaft 21 of the front wheels is increased. 1 has a ring gear 35a of a differential 35 arranged on the left side of FIG. Then, the drive gear 30a
And deceleration by the driven gear 30b and the output gear 30c
And deceleration by the ring gear (final gear) 35a of the differential 35, the deceleration is performed in two stages. Therefore, the power transmitted to the continuously variable transmission mechanism 20 is transmitted from the driven pulley 23 through the reduction gear device 30 to the differential 35, and then from the drive shaft 21 of the front wheels to the front wheels.

In FIG. 1, reference numeral 36 denotes a constant velocity joint which is arranged at a position separated from the left and right front wheels by a set distance.

Therefore, in the above embodiment, in the power train structure in which the horizontally placed engine 3 and the continuously variable transmission 20 are arranged side by side in the longitudinal direction of the vehicle body, the engine 3
Since only the torque converter 10 is arranged at the right end of the crankshaft 3e, and the forward / reverse switching device 15 is arranged in the empty space behind the vehicle body of the torque converter 10,
The vehicle width direction of the power train at the engine 3 can be shortened by the amount of the forward / reverse switching device 15.

Moreover, the drive pulley 2 of the continuously variable transmission mechanism 20.
Since 2 is arranged coaxially with the drive shaft 21 of the front wheels, the power train can be simply and compactly constructed accordingly.

In addition, 2 of the drive shaft 21 of the front wheels
The differential 35 is provided between the individual constant velocity joints 36, 36.
Even if the gap between the differential 35 and the constant velocity joint 36 on the right wheel side is narrow, two devices, the drive pulley 22 of the continuously variable transmission mechanism 20 and the forward / reverse switching device 15, are arranged in this gap. Since only the drive train is disposed and the reduction gear transmission 30 is disposed on the separately provided support shafts 23a and 31, the power train can be easily disposed on the drive shaft 21 of the front wheels.

3 to 5 show a forward / reverse switching device 1
5 shows a modified example of 5 and is constituted by a biaxial type instead of the planetary gear type.

That is, also in this modification, the drive shaft 21 of the front wheel penetrates the support shaft 22a of the drive pulley 22 of the continuously variable transmission mechanism 20 as in the above-described embodiment. The forward / reverse switching device 50 is arranged substantially rearward of the vehicle body of the torque converter 10, and a portion where the support shaft 22a of the drive pulley 22 of the continuously variable transmission mechanism 20 extends rightward in FIG. It is provided between the shaft 49 and a shaft 49 separately arranged above the shaft 21. The forward / reverse switching device 50 includes a forward gear device 51 and an idle gear 5
2a and a reverse gear device 52, and a selection mechanism 53 is arranged between the two devices. Further, another shaft 54 is arranged in line with the separately provided shaft 49.
The driven gear 25 of the power transmission mechanism 28 is arranged above. Further, a neutral clutch 56 that connects and disconnects both shafts 49 and 54 is arranged between the driven gear 25 and the reverse gear device 52.

Since the separate shaft 49 is arranged above the drive shaft 21 of the front wheel, and an empty space is formed on the left side of the shaft 49 in FIG. 3, the gear 30 of the speed reducer 30 is provided in the space.
b and 30c are arranged. Since other configurations are the same as those of the above-described embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

Therefore, also in this modification, the forward / reverse switching device 50 is arranged in the empty space formed behind the vehicle body of the torque converter 10, so that the length of the power train in the vehicle width direction is shortened at the portion where the engine 3 is arranged. it can.

Further, FIG. 6 shows another modification of the forward / reverse switching device. In this modification, the configuration of arranging the torque converter 10 at the rear of the vehicle body is the same as that of the above-mentioned embodiment, but in the above-mentioned embodiment, instead of being arranged on the drive shaft 21 of the front wheels, a separately arranged shaft 60 is provided on the planetary gears. Type forward / reverse switching device 61 is arranged, and its output is transmitted via a gear 61a to an input gear 62 arranged at the right end portion of the support shaft 22a of the drive pulley 22 of the continuously variable transmission mechanism 20 in the figure. It is a thing. The configuration of the forward / reverse switching device 60 is the same as that of the forward / reverse switching device 15 shown in FIG.

Therefore, also in this modification, the forward / reverse switching device 60 is arranged in the empty space behind the vehicle body of the torque converter 10, so that the length of the power train in the vehicle width direction at the portion where the engine 3 is arranged is effective. Can be shortened to

In the above embodiment, the torque converter 10 is used as the starting device, but it goes without saying that a clutch device may be used.

[Brief description of drawings]

FIG. 1 is a skeleton diagram showing an overall configuration of a power train structure.

FIG. 2 is a layout view seen from the side.

FIG. 3 is a view corresponding to FIG. 1 in which the forward / reverse switching device is changed.

4 is a cross-sectional view taken along the line AA of FIG.

5 is a cross-sectional view taken along the line BB of FIG.

FIG. 6 is a view corresponding to FIG. 1 in which the forward / reverse switching device is changed to another device.

[Explanation of symbols]

 2 engine room 3 engine 3e crankshaft 10 torque converter (starting device) 15, 50, 60 forward / reverse switching device 20 belt type continuously variable transmission 21 front wheel drive shaft 22 drive pulley 22a drive pulley support shaft 23 driven pulley 23a Drive shaft for driven pulley 24 Belt 28 Power transmission mechanism 35 Differential 30 Speed reducer

Claims (4)

[Claims] 1. An engine having an output shaft positioned in a vehicle width direction in an engine room, and a drive pulley support shaft and a driven pulley support shaft positioned in the vehicle body front-rear direction of the engine as the engine output shaft. A powertrain structure of a vehicle in which a belt type continuously variable transmission mechanism arranged in parallel is arranged, wherein a drive shaft of a front wheel penetrates a support shaft of a drive pulley of the continuously variable transmission mechanism, and the engine described above. Power transmission mechanism for transmitting power in the longitudinal direction of the vehicle from the continuously variable transmission mechanism to the continuously variable transmission mechanism and the drive pulley of the continuously variable transmission mechanism. Train structure. 2. A power train for a vehicle according to claim 1, wherein a starting device is arranged at one end of an output shaft of the engine, and a forward / reverse switching device is arranged in a longitudinal direction of the vehicle body of the starting device. Construction. 3. An engine having an output shaft positioned in the vehicle width direction in an engine room, and a drive pulley supporting shaft and a driven pulley supporting shaft positioned in the vehicle body front-rear direction of the engine as the engine output shaft. A powertrain structure for a vehicle in which a belt type continuously variable transmission mechanism arranged in parallel is arranged, wherein a drive shaft of a front wheel penetrates through a support shaft of a drive pulley of the continuously variable transmission mechanism, and A power train structure for a vehicle, characterized in that a reduction gear device for reducing the power transmitted to a driven pulley of the continuously variable transmission and transmitting it differentially is arranged on a shaft different from the drive shaft of the wheel. 4. An engine having an output shaft located in a vehicle width direction in an engine room, and a drive pulley support shaft and a driven pulley support shaft located in the vehicle body front-rear direction of the engine as the output shaft of the engine. A powertrain structure of a vehicle in which a belt type continuously variable transmission mechanism arranged in parallel is arranged, wherein a drive shaft of a front wheel penetrates a support shaft of a drive pulley of the continuously variable transmission mechanism, and the engine described above. A forward / reverse switching device is arranged between the power transmission mechanism for transmitting power from the vehicle to the continuously variable transmission mechanism to the rear of the vehicle body and the drive pulley of the continuously variable transmission mechanism. A powertrain structure for a vehicle, in which a reduction device that reduces the power transmitted to a driven pulley of a continuously variable transmission and transmits the power differentially is disposed on the shaft.