JPS6311199B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a drive device suitable for a small vehicle, such as a tricycle, equipped with two drive wheels.

(Problems to be solved by the prior art and the invention) The present applicant is easy to drive, lightweight,
To provide a motorized tricycle that is small in size, has excellent handling properties, and can provide a driving feeling similar to that of a two-wheeled vehicle.

Conventionally, such a drive device for a small tricycle drives a drive wheel by driving multiple gears of a transmission mechanism from an engine via a belt/pulley mechanism, for example. In such conventional means, the driving device is not integrated into a unit, which inevitably increases the size to some extent, and it is not possible to make the entire device compact or simplify the structure.

The present inventor has devised the present invention to solve the above-mentioned problems of drive devices for vehicles such as tricycles.

(Means and effects for solving the problems) An object of the present invention is to arrange a crankshaft and an axle having drive wheels at both ends in parallel, and to provide a drive gear and a clutch means on one end of the crankshaft. The other end is equipped with an ACG (generator) and a cooling fan, one end of the axle is equipped with a driven gear that meshes with the drive gear, and the other end is equipped with a friction plate that regulates the rotation of the axle. We have created a drive system for vehicles with two drive wheels, which has a unitized device, is significantly smaller, lighter, and has a simpler structure, and also has a balance between the left and right drive wheels to improve the vehicle's drive performance. It is on offer.

(Embodiment) Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. This will reveal further objects and advantages of the invention.

1 and 2 show a tricycle as an embodiment of a vehicle to which the present invention is applied, with FIG. 1 showing an external side view and FIG. 2 showing a plan view thereof. Vehicles to which the present invention is applied are not limited to tricycles, but can also be applied to four-wheel vehicles.

The tricycle 1 consists of a front body 2 and a rear body 3. The front body 2 has a bottom-floor structure similar to that of a scooter, and has a front fender part 4 at the very front, which slopes diagonally rearward and downward from the rear of the fender part 4. It has a front part 5 and a floor part 6 extending flatly to the rear. Floor part 6
A box-shaped raised wall 7 is provided at the rear of the vehicle so as to extend almost completely in the width direction, and prevents the occupant's feet from moving backward and prevents the feet from interfering with the swinging rear vehicle body 3. Functions as a foot guard.

A support post 9 for a front fork 8 is installed on the front part 5 of the front body 2, and the lower part of the front fork 8 stores and supports the front steering wheel 10, and the upper end stores and supports a bar handle 11, a headlight, and meters. A case 12 is provided. Further, a seat post 13 is installed above the central portion of the raised wall portion 7,
A seat 14 for a passenger is placed on this 13.

A joint 15 is provided on the rear lower surface of the front vehicle body 2,
A rear sub-frame 17 of the rear vehicle body 3 is connected to the rear end of the rotational swing support shaft 16, and this frame 17
A rear fork 18 is pivotally attached to the rear fork 18 so as to be swingable about a pin 19. And rear fork 18
A drive device 30 is placed on top, and the drive device 30 is disposed between the two rear drive wheels 20, 20, and is housed within the outline of the drive wheels 20, so that it is hidden from the side by the drive wheels. and is shown by a broken line as shown in Figure 1,
The wheels 20, 20 and the drive device 30 are covered with a rear fender member 21. The front vehicle body 2 can rotate and swing in the left-right direction relative to the rear vehicle body 3.

The above drive device 30 is as shown in FIGS. 3 and 4, with FIG. 3 showing a side view with main parts cut away, and FIG. 4 showing a sectional view taken along the line 4-4 in FIG. show,
By adopting the structure described below, the drive device 30 can be made smaller, unitized, and configured to include a brake device.

As shown in FIG. 3, the drive device 30 is formed into a unit, and a case 32 that also serves as a crankcase and a transmission case is provided below the engine 31, and the case 32 consists of two members 32a and 32b divided into upper and lower parts. The rear part of a case 32 forming a drive unit is pivotally attached to the rear end of the rear fork 18 by a pin 22, and in front of this, mount rubbers 23, 2
4, the case 32 is connected to the rear fork 18, and a cushion rubber 25 and a rebound stopper rubber 26 are interposed between the frame 17 and the front and rear of the shaft support 19 of the rear fork 18 so as to sandwich them therebetween. In order to improve the followability of the unit 30, that is, the followability of the rear wheels 20, 20, the unit 3
The shaft support 22 of 0 is pivotally connected to a link 28 that is pivotally connected to a pin 27 provided at the rear end of the rear fork.
The engine 32 of the unit 30 is arranged so as to be inclined rearward and upward, and the case 32 is arranged so as to be inclined rearward and downward.

FIG. 4 is a view taken along line 4-4 in FIG. 3, and since this is shown in an expanded view, the engine section 31 protrudes from the rear wheel 20, but the top of the rear wheel 20 is as shown in FIG. 3. It is housed within the outline of the rear wheel 20.

The cylinder 33 of the engine 31 is closed with a cylinder head 34 and has a piston 35 disposed therein as known.
Insert and prepare. partition wall 32c in case 32,
A crankshaft 37 whose journal portion is supported at 32c via bearings 36, 36 and the piston are connected by a connecting rod 38.

One bearing extension end 37 of the crankshaft 37
An ACG outer 39 having a flywheel function is connected to a, a cooling fan 40 is connected to the outer surface of the outer 39, and the cylinders 33, 34
Cooling air is fed through a passage 42 into a cover 41 surrounding the .

The other bearing extension of the crankshaft 37 is provided with a clutch 43 that also serves as a transmission. A drive plate whose splined engagement end forms a clutch inner 44 is provided on the shaft extension base 37b, and a centrifugal expansion element 45 and the like are attached to this drive plate 44, while a drum-shaped drive plate is provided opposite to the drive plate. A clutch outer 46 is provided on the shaft, and a shoe 47 corresponding to the element 45 is provided on a flange portion 46a of the outer 46. The outer 46 is connected to the inner end of a cylindrical shaft 48 that is rotatably fitted onto the extending end 37c of the crankshaft 37, and the end of the shaft 48 is connected to the case 32 by the bearing 4.
The outer periphery of this shaft 48 has teeth forming a reduction gear 50 on the drive side, that is, the gear 50 is disposed on the crankshaft 37 via a clutch.

The case 32 includes a portion 32d housing the crankshaft 37 and a divided portion 32e, and this portion 32e is provided with an axle 51 serving as a driven shaft, and the axle 51 is provided parallel to the crankshaft 37. The axle 51 consists of three members disposed on the same axis: one rear wheel drive shaft 52 on the right side in the figure, the other rear wheel drive shaft 53 on the left side in the figure, and an intermediate shaft 54 between them.

The drive shaft 52 and the intermediate shaft 54 are axially male and female coupled by spline engagement or the like, and are slidable in the axial direction.
The intermediate shaft 54 is axially pressed to the left in the figure by springs 55 and 56, and the end of the shaft 52 protrudes to one side of the case 32 via a bearing 57, and is coupled to the wheel hub 20a of the rear wheel 20. There is. A driven-side reduction gear 58 made of a spur gear is integrally provided on one of the drive shafts 52, and the gear 58 meshes with the drive-side reduction gear 50 provided at the end of the crankshaft. Therefore, by driving the gear 50, the drive shaft 52 and the intermediate shaft 54 are driven integrally via the gear 58.

The other end 54a of the intermediate shaft 54 is connected to the other drive shaft 53.
The shaft 53 is supported by the case 32 by a bearing 59, and the wheel hub 20a of the rear wheel 20 is connected to the extending end. On the shaft in front of the fitting end 54a of the intermediate shaft 54, that is, on the shaft on the outside of the ACG, there is a disc plate 60 which is a disc-shaped friction plate that forms the brake disc of the friction clutch type differential device and the disc brake type device. Further, on the opposite ends of the drive shaft 53, disk plates 61, which are disk-shaped friction plates, are respectively provided, and the two plates constitute a brake disk, and a brake caliper 80 is provided on the outside of each disk plate 60, 61. is arranged, and the caliper is attached to this part of the case. disk plate 6
A ring-shaped clutch facing 62 is interposed between the facing surfaces of the disc plates 60 and 61, and the facing 62 is connected to a stepped portion 6 formed on the surface of one disk plate 60.
0a, each disk plate 60, 61
are not combined. As described above, the intermediate shaft 54 is biased to the left in the figure by the springs 55 and 56, and the disc plate 60 brings the facing 62 into pressure contact with the flange portion 61 on the drive shaft 53 side, thereby creating a frictional engagement. The power of the intermediate shaft 54 is transmitted to the left drive shaft 53 via a disc plate 60, a facing 62, and a disc plate 61.
Drives the left rear wheel. Since the shafts 54 and 53 are frictionally engaged, they constitute another differential device that constitutes the brake disk as described above.

In the above, the crankshaft 37 rotates when the engine 31 is started, and the start is performed by driving the link gear 63 provided on the outer 39 with a starter motor (not shown). The drive gear 50 on the crankshaft 37 is meshed with the driven gear 58 and subjected to the load of the rear wheel 20, and due to this resistance, the drive gear 50 is idling relative to the shaft 37. At a predetermined rotation speed of the crankshaft 37, the drive plate 4
Element 45 of No. 4 expands centrifugally, engages frictionally with shoe 47, and drives clutch outer 46. That is, the centrifugal clutch shifts from the disengaged state to the connected state, and the crankshaft 37 is connected to the drive gear 50 via the clutch. As a result, driven gear 58
is driven and an axle 5 consisting of axles 52, 54, 53
1 is driven as described above, and the left and right rear wheels 20, 2
0 is driven. The difference in rotation between the inner and outer wheels during turning is obtained by the disc plates 60 and 61 forming the brake discs rotating relative to each other while creating friction via the facing 62.
Further, the brake is applied by pressing the disc plates 60, 61 toward each other with a caliper.

In this way, the centrifugal clutch 43 and the drive gear 50 are mounted on one end of the crankshaft 37, and the ACG and fan 40 are mounted on the other end of the crankshaft 37.
A power transmission system is constructed by providing an axle 51 parallel to the axle, disposing a drive gear meshing with the above drive gear on one end thereof, and providing a friction plate constituting a brake device and a differential device on the other end. Everything is housed in a case, unitized, and compact, and furthermore, the structure is simple because it uses a gear mechanism. Especially on both sides of the crankshaft.
Because the components are symmetrically divided and arranged on both sides of the axle, the arrangement is rational, and everything can be stored within the limited width while making effective use of space, and the left and right balance is also good. , smooth operation can be expected, and furthermore, if configured as in the embodiment, the differential device can be obtained as a part of the brake device.

Also, the position of the axle 51 of the brake device
Since the position is outside the ACG crankshaft extension end 37a, the brake device and
The distance between the axle 51 and the crankshaft 37 can be shortened without overlapping the ACG, thereby making the entire system more compact.

(Effect of the invention) As described above, according to the present invention, the rear wheels 20,
It was possible to achieve a compact design in which the entire drive system could be housed within 20 minutes and within the outline of the wheels 20.

In the illustrated example, the crankshaft 37 and the axle 51
Although no intermediate shaft is provided between the two, it is of course possible to increase the number of shafts and gears in between if there is a need for further deceleration, and it should be noted that the present invention includes such changes.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of the tricycle, FIG. 2 is a plan view thereof, FIG. 3 is a side view of the drive device, and FIG. 4 is a side view of the tricycle. It is a diagram along a line. In the drawing, 30 is a drive device, 37 is a crankshaft, 39 is an ACG outer, 40 is a cooling fan, 43 is a clutch, 50 is a drive gear, 51
is an axle, 58 is a driven gear, and 60 and 61 are disk plates.

Claims (1)

[Claims] 1. A crankshaft and an axle having drive wheels at both ends are arranged in parallel, and a drive gear and a clutch device are mounted on one end of the crankshaft, and a generator and a clutch device are mounted on the other end. A cooling fan is provided on one end side of the axle, and rotates integrally with the axle,
A differential device is constructed by providing a driven gear meshing with the drive gear, dividing the axle into two at the other end, and disposing friction plates that can come into contact with each other on both of the two divided axles. A vehicle drive device having two drive wheels, characterized by: 2. Driving a vehicle having two drive wheels as set forth in claim 1, characterized in that a brake device is constructed by disposing a friction plate that pinches the friction plate on the outside of the friction plate. Device.