JPH0431199Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a drive unit in a small passenger car that is integrated with the rear wheels and pivoted on a swing shaft at the rear of the vehicle body.

(Prior Art) Conventionally, in the case of small vehicles such as motorcycles and tricycles, the rear wheels are used as drive wheels, and the drive wheels and a drive device are integrated into a unit that pivots freely on a swing shaft at the rear of the vehicle body. The type of vehicle that supported it is known.

(Problem to be solved by the invention) However, when the above-mentioned vehicle is, for example, a small scooter type vehicle, the engine starting device is equipped with a starting motor etc. that can be easily handled rather than a kick type. However, since it is necessary to leave the floor step part where passengers get on and off the vehicle as wide as possible, problems have arisen regarding the mounting position of the starter and the mounting method of the drive unit.

In other words, depending on the mounting position of the starter and the axial direction of the engine cylinder of the drive unit, the front-to-back length of the floor step section is restricted, making it inconvenient to get on and off the vehicle, and also impairing ride comfort. .

(Means for Solving the Problems) In order to solve the problems, the present invention has been developed by moving the starting motor of the engine of the drive unit, which can swing freely behind the swing shaft behind the step floor, from the swing shaft. It was placed at the rear.

In addition, the engine of this drive unit has the clamp shaft placed horizontally with respect to the vehicle body, and the cylinder shaft extends backwards from the swing shaft so that the engine body does not extend forward beyond the swing shaft. I let it happen. Furthermore, the width of the starting motor was made to not extend beyond the width of the engine.

(Function) By arranging the starter motor behind the swing shaft, the floor article is left wide open and there is no inconvenience in getting on and off the floor. Also, by not protruding the engine in front of the rocking shaft and by placing the crankshaft horizontally, the seat mounting position can be lowered to the rear to the maximum extent, increasing the front-to-back length of the floor. A similar effect occurs.

Furthermore, in the lateral direction, by housing the starter motor within the width of the engine, the drive unit and vehicle body width can be made more compact, and there are no obstructions when getting on and off, making it easier to get on and off the machine.

(Embodiment) An embodiment of the drive unit of the present invention will be described based on the attached drawings.

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-wheeled vehicles or two-wheeled vehicles.

The tricycle 1 consists of a front body 2 and a rear body 3. The front body 2 has a low-floor structure similar to that of a scooter, has a front fender part 4 at the very front, and slopes diagonally rearward and downward from the rear of these parts. It has a front part 5 and a floor part 6 extending flatly to the rear. A box-shaped raised wall part 7 is provided at the rear of the floor part 6 so as to extend almost completely across 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 to prevent

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 the single front running wheel 10, and the upper end stores a bar handle 11, a headlight, and meters. A supporting case 12 is provided. A seat post 13 is provided on the central portion of the raised wall portion 7, and a seat 14 for a passenger is placed on the seat post 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. As is clear from FIG. 3, a unitized drive unit 30 is mounted on the rear part of the rear fork 18 via a pin 22 and mount rubbers 23, 24, and cushion rubbers 25,
A rebound stopper rubber 26 is provided, and the pin 22 is pivotally connected to the rear end of the rear fork 18 via a pin 27 and a link 28 to improve the followability of the drive unit 30. The drive unit 30 is provided between the two rear drive wheels 20, 20.
20 is connected to both ends of the vehicle, and the unit 30 is housed within the outer contour of the wheel 20. The cylinder portion of the engine 31 of this drive unit 30 is located at the front beyond the pin 19 (left side in Figure 3).
The cylinder axis S is mounted with its cylinder axis S tilted backward so as not to protrude from the side, and a starter motor 53, which will be described later, is provided close to the pin 19.

In the above, the drive unit 30 is the engine 3
4 is a view taken along line 4-4 in FIG. The cross-section designation line divides the case at the joint surface of the halves 32a and 32b, and a portion of the lower half is shown in cross section.

Inside the front part of the case 32 is a crankshaft 33.
is housed with its journal portion supported by bearings 34, 34, and the crankshaft is connected to a piston (not shown) via a pin 33a and connecting rod 35. At one end of the crankshaft 33 is a drive plate 37 which is the inner part of the centrifugal clutch 36.
A cylindrical body that also serves as a drive gear 39 is loosely connected to the end of this shaft, and a drum-shaped clutch outer 38 is fixed to this.
7a is centrifugally expanded and connected to the shoe 38a of the outer 38, the centrifugal clutch 36 is connected, and the power of the crankshaft 33 is transmitted to the drive gear 39.

Further, the maximum rotation speed of the crankshaft 33 is determined by a drive gear 39 which is operated via the clutch and a driven gear 49 provided on an axle 40 which will be described later.
engagement with the crankshaft 33 and the axle 40
The rotation speed is set at a predetermined rotation speed or higher for engagement with the engine.

Wheels 40 are suspended horizontally in the front part of the case 32,
The axle 40 has a right drive shaft 41 and an intermediate shaft 4 on the same axis.
2 and a left drive shaft 43, and a right drive shaft 4
1 and the intermediate shaft 42 are spline-engaged, and are urged leftward in the figure by springs 44, 44. Opposite ends of the left drive shaft 43 and the intermediate shaft 42 are loosely connected, and a disc-shaped flange portion 45,
A differential friction clutch 48 is provided between the clutch facing 46 and the clutch facing 47 which is interposed in a non-fixed manner and is engaged with one side. Then, the hubs of the left and right drive wheels 20, 20 are connected to the left and right drive shafts 41, 43, and the driven gear 49 provided on one of the drive shafts 41 is meshed with the drive gear 39 described above, so that the axle 40 is driven. , left and right wheels 20,
20 rotation difference is absorbed by the slippage of the clutch 48,
Although not shown in the figure, pads and calipers are provided on both outer sides of the flange portions 45 and 46 to constitute a disc brake device, and the flange portions 45 and 46 constitute a brake disk.

The clutch outer 3 is based on the left end of the crankshaft 33, that is, the power transmission path.
A drum-shaped flywheel 50 as a rotating body that also serves as a mounting base for the magnet of the ACG (generator) is fixedly installed in the upstream portion of the flywheel 8, and a cooling fan 51 is attached to the outer surface of the outer wall 50a of the flywheel 50. ing.

A ring gear 52 is fixed to the outer periphery of the base of the peripheral wall of the flywheel 50, and a starter motor 53 is attached to the partition wall facing the outer edge of the flywheel 50.
A faces into the case 52, and a motor part 53b faces outside the case 32. This starting motor 53
As mentioned above, is located close to the pin 19 in Fig. 3, and even if it is in the drive device 30 that swings around the axis of the pin 19 during running, it is a position where there is little vertical movement of the device. In addition to providing protection, this also facilitates wiring to the motor section 53b and the like. Further, as shown in FIG. 4, the width of the starter motor 53 is within the width of the engine provided between the drive wheels 20, 20, and the width of the starter motor 53 is within the width of the engine provided between the drive wheels 20, 20. The axial directions of 40 all extend in the width direction of the vehicle body, and are arranged compactly and concisely.

The starting motor 53 is, for example, as shown in FIG. 5, and has teeth 55a formed on the end of a starting shaft 55 provided in a housing 54, and a gear 56a provided on an output shaft 56 parallel to the teeth 55a to mesh with the teeth 55a. , axis 5
A sliding pinion 57 is fitted onto the pinion 6. Starting shaft 55
The shaft 56 is driven through the teeth 55a and the gear 56a, and the pinion 57 is moved forward from the position where the flywheel 50 is separated from the ring gear 52 at the retreated position below the center line O-O shown on the shaft 56. Then, it reaches the position shown in the diagram above O-O, engages with the ring gear 52, rotates the flywheel 50, drives the crankshaft 33, and starts the engine.Then, the pinion 57 retreats and the ring gear 52 depart from. In this case, since the axle 40 and the crankshaft 33 are connected via the centrifugal clutch 36, the starter motor 53 and the axle 40 are disconnected at the time of starting, so that no undue stress is placed on them.

In the example illustrated above, the crankshaft and the axle are connected by a gear, but a chain or sprocket mechanism may be used instead of this, and the crankshaft and the axle may be used for a four-wheeled vehicle or a two-wheeled vehicle instead of the three-wheeled vehicle shown.

(Effects of the invention) As described above, the drive unit of the invention is compactly assembled behind the swing shaft together with the starter motor, and does not protrude forward of the swing shaft, but extends laterally beyond the width of the engine. Since the structure is such that the step floor area is wide, and there are no overhangs or the like that would be an obstacle to getting on and off, it becomes easier to get on and off. Furthermore, since the engine crankshaft is placed horizontally with respect to the vehicle body, there is also the effect that the longitudinal length of the drive unit is shortened.

[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 unit, and Fig. 4 is Fig. 3 4-4. A line sectional view, FIG. 5 is a diagram showing an example of a starting motor. In the drawing, 19 is a pin, 33 is a crankshaft, 36 is a centrifugal clutch, 50 is a flywheel, 40 is an axle, 39, 49 is a gear mechanism, 20 is a wheel, 52 is a ring gear, 53 is a starter motor, 5
7 is a pinion, and S is a cylinder shaft.

Claims (1)

[Claims for Utility Model Registration] (1) A drive unit integrated with the rear wheels is pivoted by a swing shaft behind the step floor, and transmits the rotation of the starter motor to the crankshaft of the engine of this drive unit. In the drive unit for a small passenger car, the crankshaft of the engine is placed horizontally with respect to the vehicle body, and the starter motor is disposed behind the swing shaft. unit. (2) The drive unit for a small passenger car according to claim 1, wherein the cylinder shaft of the engine extends rearward from the swing shaft. (3) The drive unit for a small passenger car according to claim 1, wherein the starter motor is provided within the width of the engine in the width direction of the vehicle body.