JPS6117850Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drive device suitable for a small vehicle such as a tricycle in which two rear wheels are used as drive wheels.

More specifically, a crankshaft and an axle having two rear drive wheels at both ends are disposed in parallel, the two axles are connected by a gear transmission mechanism, and a clutch means including a transmission is connected to a plane containing the two axles. divided,
In addition, the parts that connect the inner sides of the drive wheels and the two bearings of the crankshaft are housed integrally in a square-shaped upper and lower case, which greatly improves ease of assembly and workability, and simplifies the structure. The present invention relates to a drive system for a vehicle with two rear wheels as drive wheels, which is compact, unitized, and maintains accuracy easily.

Genuine faces can be easily driven, 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.

In such a conventional drive device for a small tricycle, for example, the engine is a left-right split case that supports only the crankshaft, and the rear axle is supported by a transmission case connected to a rear fork, with a chain or other structure between the engine and the transmission case. They are connected by a belt transmission system. Since the engine and the rear axle are supported by separate parts, it is difficult to obtain the distance between the axes, the parallelism of each axle, accuracy, etc. In addition, since the engine and rear axle are assembled in completely separate cases and supported individually by the left and right cases, there are an extremely large number of tightening points, which is unfavorable in terms of assembly work.
This is disadvantageous in terms of productivity, and the number of parts inevitably increases, which combined with the above makes it difficult to reduce costs.

The present invention has been devised to solve the above-mentioned problems.

The object of the present invention is to arrange a crankshaft and an axle having two rear drive wheels at both ends in parallel, connect both axles with a gear transmission mechanism, and connect them and a clutch means including a transmission on a plane containing them. divided,
In addition, the parts that connect the inner sides of the drive wheels and the two bearings of the crankshaft are integrally housed in a square-shaped upper and lower case, making the drive unit more compact, and greatly improving assembly workability. An object of the present invention is to provide a drive device for a vehicle in which two rear wheels are used as drive wheels, which facilitates maintenance of precision, reduces costs, and reduces parts.

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

1 and 2 show a tricycle as an example 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. Vehicles to which the present invention is applied are not limited to tricycles, but can also be applied to four-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 a scooter, with a front fender 4 at the very front and a front part 5 that slopes diagonally rearward and downward from the rear of the fender 4. , a floor section 6 extending flat to the rear, and a raised wall section 7 provided so as to traverse substantially all the way in the rear width direction of the floor section 6, and this section 7 prevents interference between the occupant's feet and the rear vehicle body. and 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 the single front steering 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 in the center 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. And rear fork 18
A drive device 30 is mounted on the top, and the drive device 30 is arranged between the rear two drive wheels 20, 20, and is housed within the outline of the drive shaft 20, and the drive device 30 is disposed between the rear two drive wheels 20, 20.
The drive device 30 is covered with a rear fender member 21. In contrast to the rear vehicle body 3, the front vehicle body 2 can rotate and swing in the left and right directions.

The drive device is as shown in FIGS. 3 to 5, where FIG. 3 is a side view, FIG. 4 is a partially sectional view taken along line 4-4 in FIG. 3, and FIG. Figure 3 5
The lower half of the split case is shown in the view along line -5. By adopting the structure described below, the drive device 30 can be made smaller and unitized, and can be housed entirely in a case divided into upper and lower parts.

As shown in FIG. 3, the drive device 30 is formed into a unit, and the unit consists of an engine 31 and a case 32 below the engine 31 when viewed from the side. The rear part of a case 32 forming a drive unit is pivotally connected to the rear end of the rear fork 18 by a pin 22, and in front of this, the case 32 is connected to the rear fork 18 by mount rubbers 23 and 24, and the shaft support 19 of the rear fork 18 is Cushion rubber 25 and rebound stopper rubber 26 are installed between the front and rear frame 17.
is interposed. In order to improve the followability of the unit 30, that is, the followability of the rear wheels 20, 20, the shaft support 22 of the unit 30 is pivotally connected to a link 28 connected to a pin 27 provided at the rear end of the rear fork. The engine 31 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.

Figure 4 is a view taken along line 4-4 in Figure 3, and the engine and case are shown expanded, so the rear wheels 20
Although the engine 31 protrudes from the rear wheel 20, it is actually housed within the outline of the rear wheel 20 as shown in FIG. It doesn't appear.

The case 32 is divided into two parts 32- into upper and lower parts.
1 and 32-2, which are joined by flat joining surfaces 32-1a and 32-2a, and have a space inside. A cylinder 33 is attached to the upper half body 32-1, a cylinder head 34 is coupled thereon, and a piston 35 is fitted within the cylinder 33. Support walls 32-1b of the crankshaft 37 are formed on the left and right below the cylinder assembly of the upper half body 32-1, and support walls 32-2b are formed symmetrically at the same position on the lower half body 32-2. , halves 32-1, 32-2
The journal part of the crankshaft 37 is supported in the joined state, and bearings 36, 36 are interposed in the support part. Piston 35 and crankshaft 37
The ACG outer 39 having a flywheel function is attached to one extension 37a of the crankshaft 37, and cooling fins 40 are provided on the outer surface of the ACG outer 39. Cooling air is fed through a passage 42 into a cover 41 surrounding the .

A clutch 43 including a transmission is provided on the other extending portion 37b of the crankshaft 37, and the clutch 43 is rotatably fitted to a shaft end of a drive plate 44, which is a clutch inner connected to the crankshaft 37. It consists of a drum-shaped clutch outer 46 connected to a cylindrical shaft 48, each of which is equipped with a centrifugal expansion stop 45 and a shoe 47. At a predetermined rotational speed, the stop 45 and the shoe 47 are connected, and power is transmitted to the clutch outer 46. will be done. Cylindrical shaft 48
Teeth are formed on the periphery to form a drive gear 50, and the end of the cylinder shaft 48 is connected to each half 32-1, 32-2 of the case 32.
Half-shaped bearing portions 32-1c, 3 provided in the relevant portions of
2-2c via a bearing 49.

Weight 37c of the above crankshaft 37
The outside of the partition wall 32-2d is formed by joining the halves.
The outermost wall 32-2e of the case and the partition wall 32 are located on the outside (lower side in FIGS. 4 and 5).
A lateral space 32-2g is formed which is defined by the outer wall 32-2f of the lower half 32-2d.
-2, but the upper half 32-1 also has a symmetrical shape. An axle 51 is installed across this space 32-2g, and the male and female axles 51 are fitted together so that they can slide in the axial direction, and are pressed in one direction, that is, to the left in the figure, by springs 55 and 56. It consists of an intermediate shaft 54, a right wheel drive shaft 52, and a left wheel drive shaft 53 fitted to the end of the intermediate shaft 54 so as to be freely rotatable and slidable in the axial direction. The drive gear 5 described above is mounted on the drive shaft 52.
A large space 32-2 provided in this part of the gear 58 case is provided with a driven gear 58 that meshes with the gear 58.
h, and the other half 32-1 is also symmetrically provided with a similar space. The end of the drive shaft 52 is supported via a bearing 57 by a bearing part 32-2i formed in this part of the case, and the hub part 20a of the right wheel is attached to the extending end.
are combined. The other half also symmetrically comprises similar parts.

Flange portions 60, 61 are provided symmetrically on the end of the intermediate shaft 54 and the opposing end of the left drive shaft 53, and a ring-shaped facing 62 is interposed between them via a locking step portion 60a provided on one surface.
0.61 is frictionally engaged by the elastic force of the intermediate shaft 54 to the left in the figure to form a friction clutch, and thus power is transmitted between the intermediate shaft 54 on the right side, the drive shaft 53 and the drive shaft 52 on the left side while the facing 6
The sliding of the flanges 60 and 61 constitutes a differential device between the left and right wheels. The flanges 60 and 61 constitute a disk brake. This part of the case is partially bulged 32-2j and formed in a symmetrical shape to the other half. A part of the part 32-2j is cut out to provide a caliper that presses the flanges 60 and 61. The end of the drive shaft 53 is connected to the bearing 32-2j provided in this part of the case.
The shaft 53 is supported by the left half 2-2k via a bearing 59 and is formed symmetrically to the other half 2-2k. The extending end of the shaft 53 is connected to the hub 20a of the left wheel.

In this way, the case 32 is assembled into upper and lower halves 32-1,
The upper half body 32-2 is divided into two parts, the above-mentioned parts are assembled between them, and a cylinder is assembled to the upper half body 32-1 to form a drive unit.

As described above, in the present invention, a crankshaft and an axle having two rear drive wheels at both ends are arranged in parallel, and both axles are connected by a gear transmission mechanism, and these and a clutch means including a transmission are connected to the drive wheels. The parts that connect both inner sides of the crankshaft and both bearings of the crankshaft are integrally housed in a vertically matched case with a square shape (this is shown as A in Fig. 4). By minimizing the distance, everything can be stored rationally and very advantageously in terms of space utilization. In this way, compactness, unitization,
Fewer parts, especially since there is no need to separate the case for the engine side and the transmission, gear change, and drive sides.
Therefore, only one case with upper and lower parts is required, which reduces the number of parts and improves assembly work efficiency. Assembling can also be done by setting the parts in a predetermined position on the lower half body 32-2, covering the upper half body 32-1 from above, and tightening them with bolts, etc., and there are few tightening points, and the number of parts can be set easily. Accuracy can be obtained immediately, and accuracy can be maintained while significantly improving assembly workability. In addition, since the case is a combination of upper and lower parts, an oil bath can be used as a deceleration mechanism, which improves durability and life, and ensures long-term operation reliability and certainty. The strength of the drive unit is significantly greater than its weight. Furthermore, the part of the case that connects both the crankshaft bearings and the inside of both drive wheels has a square shape, so even if one end of the axle swings up and down, the case itself will not twist. It has many effects such as:

In the illustrated example, no intermediate shaft is provided between the crankshaft and the axle, but if further deceleration is required, a deceleration shaft may be provided between them, 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 Fig. 3 4-4. 5 is a view taken along line 5--5 of FIG. 3. In the drawing, 32 is the case, 32-1 and 32-2 are the divided halves of the case, 37 is the crankshaft, 39 is the ACG outer, 43 is the clutch,
50 is a drive gear, 51 is an axle, and 60 and 61 are brake discs.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A crankshaft and an axle having two rear drive wheels at both ends are arranged in parallel, both axles are connected by a gear transmission mechanism, and a clutch means including a transmission is connected to these. A wheel in which the rear two wheels are the driving wheels, and is integrally housed in an upper and lower case that has a square-shaped part that connects both inner sides of the driving wheels and both bearings of the crankshaft. drive unit. 2 An ACG (generator), a clutch including a transmission, and a drive gear are arranged at both ends of the crankshaft, a driven gear and a brake disc are arranged at both ends of the axle, and all of these are arranged in a plane containing them. A drive system for a vehicle having two rear wheels as drive wheels as set forth in claim 1 of the above-mentioned utility model registration, wherein the drive system is integrally housed in an upper and lower case divided into upper and lower cases.