JPH06219168A - Driving device for vehicle - Google Patents

Abstract

PURPOSE:To achieve differential control of a driving source by a small clutch by providing a pair of driving sources for rotating and driving each wheel, and the clutch for directly connecting these driving sources. CONSTITUTION:The driving force of motors 15, 17 forming a driving device 1 for vehicle, is directly connected together by a friction clutch 19, while the torques of the motors 15, 17 are amplified by planetary gear type reduction gears 21, 23 to rotate and drive each rear wheel 7, 9. The driving device 1 and the reduction gears 21, 23 are supported on a car body, and the fastening force and the rotation speed of each motor 15, 17 of the friction clutch 19 are controlled by a controller. Since the motors 15, 17 are directly connected together through the friction clutch 19 for restricting winding, the capacity and the size of the friction clutch 19 are reduced.

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.

[0002]

2. Description of the Related Art FIG. 4 shows a drive unit 201 for an electric vehicle in which a conventional vehicle engine and transmission are replaced with motors. Figure 5 shows "NIKKEI MECHANICAL
1992.1.6. P. 25 shows a drive device 203 of an electric vehicle corresponding to the one described in "No. 25". Further, Japanese Patent Laid-Open No. 4-159134 discloses a vehicle power transmission device 205 as shown in FIG.

The drive device 201 is configured to drive the wheels 211 and 213 via the differential device 209 by the drive force of one motor 207. The drive device 203 is configured such that the pair of motors 215 and 217 drive the wheels 219 and 221 respectively.
In the power transmission device 205, the motors 223 and 225 drive the front wheels 231 and 233 via the speed reducers 227 and 229, and are connected via the clutch 235 so that differential limitation can be performed.

[0004]

However, the drive unit 20
Since No. 1 does not have a differential limiting function, if one of the wheels 211 and 213 runs idle, the driving force of the vehicle is lost. On the other hand, the drive device 203 can travel with the driving force of the other motor even if one of the wheels 219 and 221 runs idle, but in this case, only the driving force of one of the motors 215 and 217 can be used and the left and right driving forces can be used. Due to the unbalance, the straight running stability of the vehicle decreases. In the power transmission device 205, the clutch 23
Although such a problem is solved by the differential limiting function of No. 5, the torque of the motors 223 and 225 is reduced by the speed reducer 22.
Since it is amplified by 7, 229 and input to the clutch 235, the clutch 235 needs a large capacity and becomes large in size.

Therefore, an object of the present invention is to provide a vehicle drive device capable of limiting the differential of a pair of drive sources for driving the respective wheels with a small clutch.

[0006]

In order to solve the above problems, the present invention is provided with a pair of drive sources for rotationally driving respective wheels, and a clutch for directly connecting these drive sources. .

[0007]

Unlike the conventional example of FIG. 6 in which the speed reducer is arranged between the drive source and the clutch, the vehicle drive device of the present invention directly connects the drive source with the clutch and therefore does not handle large torque. It is possible to limit the differential with a small capacity.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment will be described with reference to FIGS. FIG. 1 shows a vehicle drive device 1 of this embodiment, and FIG.
Shows the power system of the vehicle using this embodiment. The left and right directions are the left and right directions in this vehicle and FIG. It should be noted that members and the like without reference numerals are not shown.

As shown in FIG. 3, this power system comprises a vehicle drive device 1, rear axles 3, 5, left and right rear wheels 7, 9, left and right front wheels 11, 13, and the like.

As shown in FIG. 1, the vehicle drive device 1 includes a pair of motors 15 and 17 (driving sources) and a friction clutch 19 (clutch) that directly connects these driving sources. The driving force of each of the motors 15 and 17 has its torque amplified by the planetary gear type speed reducers 21 and 23, respectively, to drive the respective rear wheels 7 and 9 to rotate. Drive device 1 and reduction gear 2
1, 23 are supported by the vehicle body.

The rotation speeds of the motors 15 and 17 are separately controlled by the controller to accelerate / decelerate the vehicle, move straight, or turn.

The friction clutch 19 has its engagement force adjusted by the controller in accordance with the running state of the vehicle as described below.

The friction clutch 19 is released during traveling on a good road. In this case, the motors 15 and 17 perform the above-described rotation speed control independently of each other without mutual interference by the friction clutch 19.

When the friction clutch 19 is gently engaged, the differential force between the rear wheels 7 and 9 is appropriately limited by the engagement force and slippage, and the straight running stability of the vehicle is improved.

When the engagement force of the friction clutch 19 is increased, the left motor 15 is rotated even if the left rear wheel 7 spins on a bad road or the like.
Driving force is efficiently transmitted to the right motor 17 side, so that the driving torque does not decrease and traveling performance is not lost. Further, when traveling straight ahead with a low load, it is possible to travel while maintaining the left-right balance with only the driving force of one of the motors 15 and 17, and the other motor can be stopped.

In this embodiment, since the motors 15 and 17 are directly connected by the friction clutch 19, unlike the conventional example shown in FIG. it can. Further, the vehicle drive device including the speed reducers 21 and 23 is arranged coaxially with the rear axles 3 and 5, and is compact in the radial direction.

Next, a second embodiment will be described with reference to FIGS.

The vehicle drive unit 25 of this embodiment is also arranged on the rear wheels 7, 9 side of the vehicle shown in FIG. The left and right directions are the left and right directions in this vehicle and FIG. In addition, members and the like without reference numerals are not shown.

As shown in FIG. 2, the driving device 25 includes a pair of motors 27 and 29 (driving source) and a friction clutch 31 (clutch) that directly connects the output shafts of these motors. Each of the motors 27, 29 has a small diameter sprocket 33, 35, 37, 39 and a chain 4 connecting them.
1 and 43 are connected to the rear axles 3 and 5 via speed reducers 45 and 47, and the driving forces of the motors 27 and 29 are torque-amplified by the speed reducers 45 and 47. The wheels 7 and 9 are driven to rotate. The shafts 49 and 51 of the large diameter sprockets 37 and 39 are bearings 53 and
The drive device 25 and the speed reducers 45, 47 are supported by the casing 57 via 55, and are supported by the vehicle body via the casing 57.

Each motor 27, 29 and friction clutch 31
Are controlled by the controller in the same manner as in the first embodiment to run the vehicle and limit the differential between the rear wheels 7 and 9.
The friction clutch 31 also has a small capacity unlike the conventional example of FIG. 6 and can be made small.

Since the vehicle drive device 25 of this embodiment is offset from the rear axles 3 and 5, the minimum ground clearance of the vehicle can be increased.

In the present invention, the clutch is not limited to the friction clutch but may be a dog clutch. Further, the vehicle drive device of the present invention may be used in a four-wheel drive vehicle and configured to transmit the drive force of each drive source to the front wheel side and the rear wheel side via the differential devices.

[0023]

According to the vehicle drive device of the present invention, the pair of drive sources for rotationally driving the respective wheels are directly connected to each other through the differential limiting clutch, so that the clutch has a small capacity. It can be made compact.

[Brief description of drawings]

FIG. 1 is a mechanism diagram showing a configuration of a first embodiment.

FIG. 2 is a skeleton mechanism diagram showing a power system of a vehicle using a second embodiment.

FIG. 3 is a mechanism diagram showing a configuration of each embodiment.

FIG. 4 is a mechanism diagram showing a first conventional example.

FIG. 5 is a mechanism diagram showing a second conventional example.

FIG. 6 is a mechanism diagram showing a third conventional example.

[Explanation of symbols]

 1,25 Vehicle drive device 7,9 Rear wheel (wheel) 15,17,27,29 Motor (drive source) 19,31 Friction clutch (clutch)

Claims (1)

[Claims] 1. A vehicle drive device comprising: a pair of drive sources that rotationally drive respective wheels; and a clutch that directly connects the drive sources.