JPH02390Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rear wheel unilateral drive vehicle 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]

Vehicles with one rear wheel drive generally have the advantage that they do not require a differential mechanism, etc., and the power transmission mechanism to the rear wheels is simple and inexpensive compared to vehicles with both rear wheels. A rear body with a pair of left and right rear wheels is connected to a front body with one front wheel that can be steered, and the driving force of the engine mounted on the rear body is transmitted to one of these rear wheels. Japanese Patent Application Laid-Open No. 52-35043 discloses a tricycle having a driving wheel as a driving wheel and a non-driving wheel as the other wheel to which the driving force is not transmitted.
It is disclosed in Japanese Patent Application Laid-Open No. 54-67937, Publication of Utility Model Publication No. 52-52363, Publication of Utility Model Publication No. 57-3912, etc.

These tricycles have an engine mounted on a rear body frame that is swingably connected to the front body, and the axle to which the rear wheel is attached is mounted parallel to the engine's crankshaft on the rear body frame or the engine. It is supported in the case at a position rearward of the crankshaft, and drives one rear wheel by transmitting the driving force of the engine to the drive axle via a power transmission mechanism consisting of a clutch mechanism, a speed reduction mechanism, etc.

[The problem that the idea aims to solve]

In conventional rear wheel unilateral drive tricycles, the engine mounting position and the axle support position are separated from each other in the longitudinal direction of the vehicle body, which creates a dead space between the two rear wheels, increasing the overall length of the vehicle. , compactness was desired.

Furthermore, since the engine, which is a heavy object, and the rear wheels are far apart in the longitudinal direction of the vehicle body, there was a problem with maneuverability during cornering.

Therefore, the present invention effectively utilizes the space between the rear wheels to shorten the overall length of the vehicle, reduce the weight of the vehicle, and
The rear wheels have been designed to be more compact, bring the center of gravity of the engine as close as possible to the rear wheels, improve cornering maneuverability, improve workability in assembly and maintenance, and effectively cool the engine. The object is to provide a one-sided drive vehicle.

[Means to solve the problem]

The present invention comprises a 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 single-side drive vehicle, an engine includes a shroud that covers a cylinder; a drive wheel side cover that is removably provided on one side of a crankcase that supports the crankshaft of the engine; a crank mounted on the drive wheel side cover; a driving wheel axle supported coaxially with one output end of the crankshaft protruding from the case; and an axle for driving wheels disposed between the output end of the crankshaft and the driving wheel axle, for transmitting the driving force of the engine to the crankshaft. a deceleration mechanism that transmits transmission to the drive wheel axle via;
an engine cooling fan provided at the other output end of the crankshaft protruding from the crankcase for forced air cooling of the cylinder portion of the engine covered by the shroud; and assembled to constitute a drive wheel unit; a non-driving wheel side cover that is removably provided on the other side and has an air intake port that covers the engine cooling fan; and a non-driving wheel axle supported by the non-driving wheel side cover; It is characterized by comprising a unit.

Furthermore, at the inner end of the non-driving wheel axle,
A labyrinth plate is provided to cover the axle support inner end of the non-drive wheel side cover.

〔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.

Figures 1 and 2 are a side view and a rear view showing the external appearance of the rear-wheel unilateral drive type tricycle, and this vehicle has the following features:
A rear vehicle body 2 is connected to the front vehicle body 1 via a joint mechanism 3, and the front vehicle body 1 can be banked left and right with respect to the rear vehicle body 2 by the joint mechanism 3, and the rear vehicle body 2 is connected to the front vehicle body 1. It is provided so as to be swingable in the vertical direction.

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 drive wheel unit 8, a non-drive wheel unit 9, and a pair of left and right rear wheels.
The left rear wheel is the non-drive wheel 1 to which no driving force is 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. 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.

As described above, since the driving wheel unit 8 and the non-driving wheel unit 9 having the engine 19 are disposed in the space between the driving wheel 10 and the non-driving wheel 11, it is possible to improve the space utilization efficiency and to The vehicle body is made more compact and the overall length of the vehicle can be shortened. In addition, the engine 19, which is a heavy object,
The drive wheel unit 8 having a drive wheel unit 8 is fitted between a drive wheel 10 and a non-drive wheel 11 which are both rear wheels, and the center of gravity of the vehicle is located between the drive wheel axle 21 and the non-drive wheel axle 41.
, improving maneuverability when cornering.
Further, the engine cooling fan 34 supplies cooling air to the cylinder portion 19c covered by the shroud 18, and the engine 19 is effectively cooled. Furthermore, water, mud, etc. drawn to the center of rotation of the engine cooling fan 34 are repelled by the labyrinth plate that covers the axle support inner end of the non-driving wheel side cover 17, and Prevent water, mud, etc. from adhering to the bearings as much as possible.

[Effect of idea]

As described above, the single-wheel drive vehicle of the present invention includes an engine equipped with a shroud that covers the cylinder part, and a driving wheel side cover that is removably installed on one side of the crankcase that supports the crankshaft of the engine. and a drive wheel axle supported on the drive wheel side cover coaxially with one output end of the crankshaft protruding from the crankcase;
A reduction mechanism is disposed between the output end of the crankshaft and the drive wheel axle, and transmits the driving force of the engine to the drive wheel axle via the crankshaft, and the other side of the crankshaft protrudes from the crankcase. An engine cooling fan provided at the output end for forced air cooling of the cylinder portion of the engine covered by the shroud is assembled to form a drive wheel unit, and the fan is removably provided on the other side of the crankcase. Since the non-driving wheel unit is composed of a non-driving wheel side cover having an air intake port that covers the engine cooling fan and an axle for the non-driving wheel supported by the non-driving wheel side cover, the driving wheel and the non-driving wheel A driving wheel unit having an engine can be disposed in the space between the two wheels, making effective use of the space between the two wheels, contributing to a lighter and more compact vehicle body, and shortening the overall length of the vehicle.

In addition, since the drive wheel axle is placed coaxially with the crankshaft, the drive wheel unit fits between both rear wheels, bringing the center of gravity of the vehicle closer to the drive and non-drive wheel axles, improving maneuverability during cornering. do.

In addition, we also install and remove engine cooling fans and non-drive wheel axles, and replace these parts.
Maintenance such as grease addition can be performed by attaching and detaching the non-drive wheel side cover, improving work efficiency.

Moreover, most of the drive wheel axles and the reduction mechanism are covered by the drive wheel side cover, and most of the non-drive wheel axles and the engine cooling fan are covered by the non-drive wheel side cover, so they are protected from the outside. increases.

Further, the engine can be effectively cooled by the engine cooling fan.

Furthermore, water, mud, etc. that enter the non-drive wheel side cover together with the cooling air and are attracted to the center of rotation of the engine cooling fan are transferred to a labyrinth plate that covers the axle support inner end of the non-drive wheel side cover. This prevents as much as possible water, mud, etc. from being blown away and adhering to the bearing of the non-drive wheel axle.

[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 D...the axis of the cylinder.

Claims (1)

[Claims for Utility Model Registration] 1. Comprising a steerable front wheel 5 and a pair of left and right rear wheels, one of the rear wheels is a driving wheel 10 to which driving force is transmitted, and the other is a driving wheel 10 to which driving force is not transmitted. In a rear wheel unilateral drive vehicle with non-driven wheels 11, an engine 19 includes a shroud 18 that covers a cylinder portion 19c; and an engine 19 that is removably provided on one side of a crankcase 12 that supports a crankshaft 20 of the engine 19. Drive wheel side cover 15; Crank case 1 is attached to the drive wheel side cover 15.
a driving wheel axle 21 supported coaxially with one output end of the crankshaft 20 protruding from the engine 1 ;
a reduction gear mechanism 32 that transmits the driving force of 9 to the drive wheel axle 21 via the crankshaft 20;
and; an engine cooling fan 34 that is provided at the other output end of the crankshaft 20 protruding from the crankcase 12 and forcibly air-cools the cylinder portion 19c of the engine 19 covered by the shroud 18; and a drive wheel unit is assembled. 8 and a non-driving wheel side cover 17 having an air intake port 48 which is removably provided on the other side of the crankcase 12 and covers the engine cooling fan 34; A rear wheel unilateral drive vehicle characterized in that a non-driving wheel unit 41 is constituted by a supported non-driving wheel axle 41; 2. The non-driving wheel axle 41 is provided at its inner end with a labyrinth plate 42 that covers the axle support inner end of the non-driving wheel side cover 17. Vehicle with rear wheel drive on one side.