JPH0357596Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rear wheel unilateral drive tricycle in which one of a pair of left and right rear wheels is a driving wheel and the other is a non-driving wheel.

[Conventional technology]

Compared to dual rear wheel drive tricycles, tricycles with rear wheel drive on one side generally do not require a differential mechanism, and have the advantage that the power transmission mechanism to the rear wheel is simple and inexpensive. , a front body with one front wheel that can be steered is connected to a rear body with a pair of left and right rear wheels, and one of these rear wheels is
Japanese Patent Publication No. 30-3314 discloses a motorized tricycle in which one drive wheel is to which the driving force of an engine mounted on the rear body is transmitted, and the other is a non-drive wheel to which the driving force is not transmitted.

This tricycle has an engine mounted on a rear body frame that is swingably connected to the front body, and an axle to which the rear wheel is attached is supported at a position rearward of the crankshaft on the rear body frame. The driving force of the engine is transmitted to the drive axle via a power transmission mechanism such as a pulley and V-belt to drive one rear wheel, and this drive wheel is toe-in to improve straight-line performance. It's on.

[The problem that the idea aims to solve]

As described above, in conventional rear wheel one-side drive tricycles, in order to toe-in the drive wheel, the drive wheel axle is installed at an angle with respect to the center line of the vehicle body, so the crankshaft and the drive wheel axle are The power transmission mechanism disposed between the drive wheel axle and the drive wheel axle requires parts to correct the inclination angle of the drive wheel axle and smoothly transmit the driving force to the drive wheel axle. An increase in weight was inevitable. Furthermore, because of the necessity of providing these parts, transmission loss of driving force was inevitable.

Therefore, the object of the present invention is to provide a rear wheel unilateral drive tricycle that suppresses the increase in the number of parts and weight of the power transmission mechanism, prevents transmission loss of driving force, and improves straight-line performance. be.

[Means to solve the problem]

The present invention has one steerable front wheel and a pair of left and right rear wheels, one of which is a driving wheel to which driving force is transmitted, and the other is a non-driving wheel to which driving force is not transmitted. In a rear wheel one-side drive tricycle, a crankshaft and a drive wheel axle including the drive wheel are inclined at the same angle with respect to a vehicle body center line so that the drive wheel toe-in, and the drive wheel is provided with the non-drive wheel. The vehicle is characterized in that the axles for the non-driving wheels are arranged perpendicularly to the center line of the vehicle body.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to a rear-wheel single-drive tricycle equipped with a two-stroke engine will be described with reference to the drawings.

1 and 2 are a side view and a rear view showing the external appearance of the above-mentioned rear wheel one-side drive type tricycle. This tricycle has a rear body 2 connected to a front body 1 via a joint mechanism 3, and The vehicle body 1 is provided so as to be bankable to the left and right with respect to the rear vehicle body 2 by the joint mechanism 3, and the rear vehicle body 2 is swingable vertically relative to the front vehicle body 1.

The front body 1 includes a handle 4, a front wheel 5, a step floor 6, a seat 7, and the like. The rear vehicle body 2 also includes a driving wheel unit 8, a non-driving wheel unit 9, and a pair of left and right rear wheels, and as described later, a driving wheel 10 to which driving force is transmitted to the right rear wheel
The left rear wheel is the non-drive wheel 1 to which the driving force is not transmitted.
It is set as 1.

3 to 5 show a driving wheel 10 and a non-driving wheel 1.
1 is a side view, a plan view, and a front view showing the external appearance of the main body of the rear vehicle body 2 with the left crankcase half 12a and the right crankcase half with the connecting arm 13 connected to the joint mechanism 3 protruding from the left crankcase half 12a. body 1
2b to form a crankcase 12, and a drive wheel side cover 15 is attached to one side of the crankcase 12 by several bolts 14, and a non-drive wheel side cover 15 is attached to the other side of the crankcase 12 by several bolts 16. Wheel side covers 17 are provided in a removable manner, and a shroud 18 is further provided to cover a cylinder portion 19c of an engine 19, which will be described later.

FIG. 6 is a sectional view showing details of the rear vehicle body 2.
The drive wheel unit 8 is attached to and detached from one side of the crankcase 12, which is composed of left and right crankcase halves 12a and 12b that support the engine 19 and the crankshaft 20 of the engine 19, that is, the outside of the right crankcase 12b. A drive wheel side cover 15 that can be provided, and a drive wheel side cover 15,
A drive wheel axle 21 is supported coaxially with one output end of the crankshaft 20 protruding from the right crankcase half 12b, and a drive wheel axle 21 is disposed between the output end of the crankshaft 20 and the drive wheel axle 21. A power transmission mechanism 22 that transmits the driving force of the engine 19 to the drive wheel axle 21 via the crankshaft 20, and a power transmission mechanism 22 that is disposed on the other output end side of the crankshaft 20 that protrudes from the left crankcase half 12a. Auxiliary equipment around the engine 2
3 are integrally assembled.

The engine 19 has a cylinder portion 1 formed by a cylinder block 19a with fins and a cylinder head 19b provided on the cylinder block 19a.
A plug 24 is provided in the cylinder head 19b with the ignition part facing the combustion chamber, and a piston 25 is provided in the cylinder of the cylinder block 19a so as to be able to reciprocate. It is transmitted to the crankshaft 20 via the conrod 26, and the crankshaft 20
Rotate. The cylinder portion 19c is covered with a shroud 18. 19d is a scavenging port.

The crankshaft 20 is configured by connecting left and right shafts 20a and 20b with a crank pin 20c, and the left shaft 20a connects to the left crankcase half 12a via a ball bearing 27.
The right shaft 20b is supported by the right crankcase half 12b via ball bearings 28, respectively. Further, a connecting rod 26 is connected to the crank pin 20c via a metal 29. Further, the right shaft 20b has a hollow portion 20d formed therethrough along its axis.
At the end inside the right crankcase half 12b of d,
A seal 30 for preventing the mixed gas from blowing through is provided.

One output end of the crankshaft 20, that is, the right crankcase half 12 of the right shaft 20b.
A clutch mechanism 31 and a deceleration mechanism 3 are provided between the outer end protruding from b and the drive wheel axle 21.
The power transmission mechanism 22, which is composed of two parts, is disposed and is housed in a drive wheel side cover 15 provided on the right crankcase half 12b.

The clutch mechanism 31 includes a clutch plate 31a fixed to the outwardly projecting end of the right crankcase half 12b of the right shaft 20b, a clutch shoe 31b provided on the clutch plate 31a, and a clutch mechanism 31b and the clutch plate 31a. It is composed of a clutch outer 31c that engages and a boss 31d that is the center of rotation of the clutch outer 31c.

The speed reduction mechanism 32 includes a gear 3 that is fixed to the boss 31d and rotates integrally with the clutch outer 31c.
2a, a gear 32c and a gear 32d fixed to a counter shaft 32b whose one end is rotatably provided on the drive wheel side cover 15, and a drive wheel axle 21.
and a gear 32e which is serrated coupled to the gear 32e. The gear 32c meshes with the gear 32a, and the gear 32e meshes with the gear 32d, and the driving force from the crankshaft 20 is transmitted to the drive wheel axle 21 via the clutch mechanism 31 and reduction mechanism 32. In addition, countershaft 3
The other end of 2b is supported by the other end of a plate 32g whose base end is fixed to the drive wheel side cover 15 with a bolt 32f.

In this way, the clutch outer 31c of the clutch mechanism 31 and the speed reduction mechanism 32 are attached to the driving wheel side cover 15.
Since these are installed, maintenance such as assembly, removal, replacement of parts, and greasing are required.
Easy to install and remove by attaching and detaching the drive wheel side cover 15.
It can be done quickly.

The other output end of the crankshaft 20, that is, the left crankcase half 12 of the left shaft 20a.
Auxiliary equipment 23 around the engine is disposed on the outer end side protruding from a. The auxiliary equipment 23
, the generator 33 and the engine cooling fan 3
It is composed of 4th grade.

The generator 33 includes an outer 33b that is fastened to an outwardly extending outer end of the left crankcase half 12a of the left shaft 20a with a bolt 35 via a boss 33a, and an outer 33b provided inside the outer 33b. It is composed of a magnet 33c and a coil 33d fixed to the left crankcase half 12a, and when the crankshaft 20 rotates,
Power is generated by the electromagnetic induction action between the magnet 33c and the coil 33d.

An engine cooling fan 34 is attached to the outer 33b of the generator 33 with bolts 36, and the rotation of the engine cooling fan 34 causes forced air cooling of the cylinder portion 19c covered by the shroud 18. I try to do this.

The drive wheel axle 21 rotatably provided on the drive wheel side cover 15 is supported at its base end by the drive wheel side cover 15 via a ball bearing 37, and is supported by the clutch outer via a needle bearing 38 at its intermediate portion. 31c is rotatably supported, and the inner end is rotatably inserted into the hollow portion 20d of the right shaft 20b via a needle bearing 39. That is, the drive wheel axle 21 includes a ball bearing 37 and a hollow portion 2 of the crankshaft 20.
It is supported by a needle bearing 39 within 0d and is disposed coaxially with the crankshaft 20.

In this way, most of the drive wheel axle 21, the clutch mechanism 31, and the speed reduction mechanism 32 are housed within the drive wheel side cover 15, increasing protection from the outside.

The drive wheel 10 is pivotally attached to the outer end of the drive wheel axle 21 protruding from the drive wheel side cover 15 with a nut 40 . The drive wheel 10 is a wheel 10a that is pivotally attached to a drive wheel axle 21.
and a tire 10b provided on the wheel 10a.
The wheel 10a is provided with a brake drum 10c in which an expandable brake shoe (not shown) is disposed.

A non-driving wheel unit 9 is disposed on the auxiliary equipment 23 side of the driving wheel unit 8. The non-driving wheel unit 9 includes a non-driving wheel side cover 17 that is removably provided on the left crankcase half 12a and covers auxiliary equipment 23 around the engine such as a generator 33 and an engine cooling fan 34, and a non-driving wheel side cover 17 that is detachably provided on the left crankcase half 12a. It is comprised of an axle 41 for non-driving wheels that is rotatably supported by the wheel side cover 17 and a labyrinth plate 42 that is fixed to the inner end of the axle 41 for non-driving wheels.

The non-driving wheel axle 41 includes bearings 43 provided in bearing support portions 17a and 17b formed on the non-driving wheel side cover 17 on a substantially extended line of the rotation center of the engine cooling fan 34.
It is rotatably supported via 44. A snap ring 45 for preventing the bearing from coming off is fitted on the outside of the bearing 43. Furthermore, a labyrinth plate 42 that covers the axle support inner end of the non-driving wheel side cover 17 is fastened to the inner end of the non-driving wheel axle 41 with a nut 46 . This labyrinth plate 42 has an inner peripheral portion 4
2a to the engine cooling fan 34 side, a bent portion 42c is formed on the outer periphery of the edge 42b.
is formed by bending it toward the bearing support portion 17b side.

The non-driving wheel unit 9 configured in this way is
It is attached to the drive wheel unit 8 by fixing the non-drive wheel side cover 17 to the left crankcase half 12a, and the auxiliary equipment 23 around the engine, such as the generator 33 and the engine cooling fan 34, are attached to the non-drive wheel unit 8. It is covered by a wheel side cover 17. On this occasion,
The labyrinth plate 42 is disposed close to and facing the engine cooling fan 34.

Therefore, most of the axles 41 for non-driving wheels, the generator 33, and the engine cooling fan 34
The auxiliary equipment 23 around the engine is housed within the non-drive wheel side cover 17 to enhance protection from the outside.

Furthermore, the assembly and removal of the generator 33, engine cooling fan 34, and non-driving wheel axle 41 can be done easily and quickly by attaching and detaching the non-driving wheel side cover 17. Therefore, these parts can be replaced easily. It also improves the workability of maintenance such as cleaning and greasing.

Furthermore, since the non-driving wheel side cover 17 supports the non-driving wheel axle 41 and serves as a fan cover for the engine cooling fan 34, the non-driving wheel axle supporting member and the engine Compared to providing separate cover members for each cooling fan, the rear vehicle body can be made more compact.

The non-driving wheel 11 is pivotally attached to the outer end of the non-driving wheel axle 41 with a nut 47 . The non-driving wheel 11 is composed of a wheel 11a that is pivoted to the non-driving wheel axle 41, and a tire 11b provided on the wheel 11a.
1a is provided with a brake drum 11c in which an expandable brake shoe (not shown) is disposed.

The non-driving wheel side cover 17 is provided with an air intake port 48 facing toward the front of the vehicle body, and when the crankshaft 20 continues to rotate as the piston 25 reciprocates, air is sucked in by the rotation of the engine cooling fan 34. The cooled air is transferred to the non-drive wheel side cover 17.
Cooling passage 49 covered by shroud 18 from inside
After cooling the cylinder portion 19c, it is discharged from the gap 50 between the shroud 18 and the drive wheel side cover 15, etc. Thereby, the engine 19 is effectively cooled.

In addition, water, mud, etc. that have entered the inside of the non-drive wheel side cover 17 along with the cooling air are concentrated near the inner end of the non-drive wheel axle 41 because the center of rotation of the engine cooling fan 34 becomes a negative pressure. However, the labyrinth plate 42 is connected to the engine cooling fan 3.
4, so that when the non-driving wheels 11 rotate together with the driving wheels 10 during driving,
The axle 41 for non-driving wheels and the labyrinth plate 42 also rotate together with the non-driving wheels 11, and are repelled by the centrifugal force of the labyrinth plate 42, causing water to flow to the inner end of the support of the axle 41 for non-driving wheels. Adhesion of mud, etc. is prevented as much as possible.

The axis A of the non-driving wheel axle 41 is perpendicular to the vehicle body center line B, but the axis C of the driving wheel axle 21 and the crankshaft 20 is aligned with the vehicle body center line because the driving wheel 10 is toe-in. The cylinder axis D, which is perpendicular to the axis C, is tilted slightly to the right so that it intersects with the vehicle center line B at the front of the vehicle. are doing. The inclination of the drive wheel axle 21 allows both wheels to move straight in a straight line when the rear wheels are driven on one side.

A bracket 17c formed on the non-drive wheel side cover 17 rotatably supports one end of a kick shaft 51 for engine starting, and the other end of the kick shaft 51 passes through the left crankcase half 12a. It is rotatably supported by the right crankcase half 12b.

Both crankcase halves 12a of the crankshaft 51,
A quick threaded portion 52 is formed on the outer periphery located between 12b, and a plunge gear 53 screwed into the quick threaded portion 52 is connected to a gear 54 loosely fitted to the lock shaft 51.
It is configured to mesh with the This gear 54
is disposed parallel to the crankshaft 51 between the left and right crankcase halves 12a and 12b, and meshes with a gear 56 fixed to a rotatably supported countershaft 55, and is also fixed to the countershaft 55. The gear 57 meshes with the gear 58 fixed to the right shaft 20b of the crankshaft 20,
The rotation of the plunge gear 53 which is plunged into the gear 54 by the rotation of the kick shaft 51 is transmitted to the crankshaft 20, thereby prompting the engine 19 to start. 59 is a return spring for the plunge gear 53, and 60 is a return spring for the kick shaft 51. Please note that this kick mechanism is for emergency use only.
The kick pedal is not permanently installed on the kick shaft 51.

In addition, a worm 6 is attached to the counter shaft 55.
1 is provided, and the worm 61 is provided with a kick shaft 5.
The drive gear 62 of the oil pump disposed in the space between the worm 61 and the countershaft 55 is orthogonally meshed with each other, and when the engine 19 starts and the countershaft 55 continues to rotate, the rotation of the worm 61 Therefore, the drive gear 62 of the oil pump is driven, and oil is pumped to the lubricated parts.

When the crankshaft 20 continues to rotate as the piston 25 reciprocates, the rotational force is transmitted to the deceleration mechanism 32 via the clutch mechanism 31, the driving force is transmitted to the drive wheel axle 21, and the right rear wheel is driven. It functions as a ring 10. On the other hand, the non-driving wheel 11
rotates integrally with the non-driving wheel axle 41 following the driving of the driving wheels 10. At this time, in order to toe-in the drive wheel 10, the cylinder axis d is tilted to the right with respect to the vehicle center line b, and the axes c of the drive wheel axle 21 and crankshaft 20 are tilted so that the drive wheel 10 side is at the front of the vehicle body. Since the axis A of the non-driving wheel axle 41 is set perpendicular to the vehicle body center line B, straight-line performance is improved.

In this case, the driving wheel axle 21 and the crankshaft 20 are arranged coaxially, and the driving wheel axle 21 and the crankshaft 20 are arranged on the same axis.
Since they are tilted at the same angle so that the 0 side is at the front of the vehicle body, compared to the conventional example described above, it is possible to prevent transmission loss of driving force, suppress an increase in the number of parts of the power transmission mechanism 22, and prevent an increase in weight. I can do it.

As described above, since the driving wheel unit 8 having the engine 19 is disposed in the space between the driving wheels 10 and the non-driving wheels 11, it is possible to improve the space utilization efficiency and to make the driving wheel unit 8 more compact. This allows the overall length of the vehicle to be shortened.
Further, the driving wheel unit 8 having the engine 19, which is a heavy object, fits between the driving wheels 10 and the non-driving wheels 11, which are both rear wheels, and the center of gravity of the vehicle approaches the driving wheel axle 21 and the non-driving wheel axle 41. , improves maneuverability when cornering.

[Effect of idea]

As described above, the rear wheel unilateral drive tricycle of the present invention has a crankshaft and a driving wheel axle provided with one rear wheel tilted at the same angle with respect to the vehicle body center line so that the driving wheel toe-in. At the same time, the axles for the non-drive wheels, which include the other rear wheel, are arranged perpendicular to the vehicle center line, which not only prevents transmission loss of driving force, but also reduces the number of parts and weight of the power transmission mechanism. This can improve straight-line performance.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the appearance of a rear wheel unilateral drive vehicle to which an embodiment of the present invention is applied, Fig. 2 is a rear view, and Figs. 3 to 5 are with the drive wheels and non-drive wheels removed. 3 is a side view, FIG. 4 is a plan view, FIG. 5 is a front view, and FIG. 6 is a sectional view showing details of the rear vehicle body. 5... Front wheel, 8... Drive wheel unit, 9... Non-drive wheel unit, 10... Drive wheel, 11... Non-drive wheel, 12... Crank case, 15... Drive wheel side cover, 17... Non-drive wheel side cover, 19...
Engine, 20... Crankshaft, 21...
Drive wheel axle, 22...Power transmission mechanism, 23
...Auxiliary equipment, 31...Clutch mechanism, 32...Deceleration mechanism, 34...Engine cooling fan, 41...
...axle for non-driving wheels, 42... labyrinth plate, a... axis of axle for non-driving wheels, b...
The center of the vehicle body, C...the axis of the drive wheel axle and crankshaft, and the cylinder axis.

Claims (1)

[Scope of utility model registration request] Rear wheel unilateral drive, which has one front wheel that can be steered and a pair of left and right rear wheels, with one of the rear wheels being the driving wheel to which driving force is transmitted and the other being a non-driving wheel to which driving force is not transmitted. In the type tricycle, the crankshaft and the drive wheel axle including the drive wheel are inclined at the same angle with respect to the vehicle body center line so that the drive wheel toe-in, and the non-drive wheel axle including the non-drive wheel A rear wheel unilaterally driven tricycle, characterized in that each axle is arranged perpendicular to the center line of the vehicle body.