JPS6264688A - Front wheel drive system of two-wheel automobile - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a front wheel drive system for a two-wheel vehicle such as a motorcycle, and its purpose is to efficiently transmit rotational driving force from an engine to the front wheels, and to
To provide a front wheel drive system that does not have the disadvantage of rotating the front wheels when turning a steering wheel when stopped.

In order to achieve the above object, the front wheel drive system for a two-wheeled vehicle of the present invention has the following configuration. That is, it consists of an input shaft to which the rotational driving force from the engine is transmitted and a bevel gear fixed to the output end, and two shafts that are orthogonal to the input shaft and rotatable about the handle main shaft. A bevel gear is fixed to the upper end of each shaft in a facing state and meshed with the bevel gear.

In addition, each shaft is rotatably supported within a pair of cylindrical frames configured to be rotatable as the handle rotates around the handle main shaft, and a driven shaft having a spur gear fixed to the lower end of each shaft. Each rotating shaft has a spur gear meshed with each of the spur gears fixed to its upper end, and a bevel gear fixed to its lower end, and two shafts rotatably fitted on the axle. A front wheel drive shaft having sun gears consisting of bevel gears fixed to opposing ends of the two shafts, and having bevel gears meshed with the bevel gears fixed to the lower ends of each rotation shaft fixed to each other end; A front support shaft having a planetary gear formed of a bevel gear whose side is rotatably fitted into a fitting opening formed on the inner circumferential surface of a front wheel hub, and whose other end is meshed with each of the sun gears. It is characterized by being composed of.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

Figures 1 and 2 are both longitudinal sectional front views of the front wheel drive system for a two-wheeled vehicle according to the present invention viewed from the direction of the riding position, with Figure 1 showing the operating state of the front wheel drive when running, and Figure 2 showing the front wheel drive system at rest. The operating conditions are shown when the steering wheel is turned to the right.

In FIGS. 1 and 2, reference numeral 1 denotes an input shaft to which a bevel gear 2 is fixed at its output end. Rotational driving force in the direction of the arrow shown in the figure is transmitted. The input shaft 1
The rotational driving force of the engine transmitted to the input shaft 1 may be configured such that the rotational driving force is transmitted to the rear wheels by a drive shaft (not shown) and then further transmitted to the input shaft 1 by another drive shaft. It is also possible to adopt a configuration in which the rotational driving force is directly transmitted to the input shaft 1 by the drive shaft without going through the rear wheels.

Reference numerals 3a and 3b denote driven shafts consisting of two shafts perpendicular to the input shaft 1, and each of the driven shafts 3a and 3b is rotated through a bearing (not shown) with care about a handle main shaft 4 fixed to the vehicle body frame. It is set up to do so. Bevel gears 5 and 6 are fixed to the upper ends of the driven shafts 3a and 3b, respectively, and the bevel gears 5 and 6 are disposed facing each other. are interlocked with each other. Further, spur gears 7 and 8 are fixed to the lower ends of the driven shafts 3a and 3b, respectively. With this configuration, the rotational driving force of the input shaft 1 is transmitted to each of the two driven shafts as opposite rotational driving forces.

Reference numerals 9a and 9b refer to a pair of handlebars 9a and 9b that are configured to be able to rotate in accordance with the turning operation of the handle 10 about the handlebar main shaft 4 fixed to the vehicle body frame, and are arranged at symmetrical positions with the handlebar main shaft 4 as the center. Cylindrical frame lla, l
The pivot shafts are respectively rotatably supported within the lbs.

A spur gear 12 is provided at the upper end of each of the rotating shafts 9a and 9b.
．． 13 is fixed, and among these spur gears 12.13,
The spur gear 12 provided on the left side in FIG. 1 is meshed with the spur gear 7 fixed to the driven shaft 3a which is rotationally driven in the clockwise direction in the figure, and the spur gear 13 provided on the right side is Driven shaft 3 that is rotationally driven in the counterclockwise direction
It meshes with a spur gear 8 fixed to b. Also, bevel gears 14 and 15 are provided at the lower ends of each of the rotating shafts 9a and 9b, respectively.
is fixed. With this configuration, in FIG. 1, the rotation shaft 9a on the left side receives a rotational driving force in a counterclockwise direction as shown in the figure, and the rotation shaft 9b on the right side receives a rotational driving force in a clockwise direction as shown in the figure. Reportedly. Moreover, when the handle 10 is simply turned, each turning shaft 9a, 9
Spur gears 12 and 13 fixed to the upper end of b rotate in the same direction around the respective spur gears 7 and 8 that mesh with the spur gears 7 and 8.

Reference numerals 16a and 16b denote front wheel drive shafts each consisting of two shafts rotatably fitted onto an axle 17 fixed to the vehicle body frame, and each of the front wheel drive shafts 16a and 16b has a bevel gear at its opposite end. Sun gears 18a and 18b are fixed to face each other. Further, each of the front wheel drive shafts 16a, 1
At each other end of 6b, a bevel gear 19 meshes with the bevel gears 14 and 15 fixed to the lower ends of the pivot shafts 9a and 9b.
, 20 are fixed respectively. Further code 21.21
is a bevel gear whose one end is rotatably fitted into a fitting recess 24.24 formed on the inner circumferential surface of the hub 23 of the front wheel 22, and whose other end is meshed with each of the sun gears 18a, 18b. This is a front wheel support shaft to which a planetary gear 25.25 consisting of is fixed. With this configuration, the rotational driving force in the opposite rotation shown by the arrows transmitted from the turning shafts 9a and 9b becomes a rotational driving force in the same direction as shown by the arrows in FIG. 1, and is transmitted to the wheel drive shaft. As a result, each planetary gear 25.25 of the front wheel support shaft 21, 21 meshed with the sun gear 18a, 18b.
revolves around the axes of the sun gears 18a and 18b, that is, the axes of the front wheel drive shafts 16a and 16b, in the same rotation direction as the front wheel drive shafts, and thus the front wheel support shafts 21 and 21
The front shaft 22 supported by the front shaft 22 is driven one revolution. Moreover, when the handle 10 is turned as described above, each turning shaft 9a, 9
b are rotated in the same direction, but this rotational force is transmitted to each front wheel drive shaft 16a, 16b as an opposite rotational force, and each planetary gear 25, 25 only rotates at its meshing position and does not revolve. A fitting recess 24 formed in the hub 23 of the front shaft 22
A front wheel support shaft 21.
21 rotates idly within the fitting recesses 24, 24, and as a result, no rotational driving force is applied to the front shaft 22.

Next, the operating state of the present invention will be explained separately into the front wheel drive operating state during running as shown in FIG. 1, and the operating state when the steering wheel is turned when the vehicle is stopped as shown in FIG.

First, we will explain the driving operation state during driving. 1. The input shaft 1 is connected to the input shaft 1 from the engine (not shown) via the drive shaft.
A rotational driving force is applied in the direction of the arrow. This rotational driving force is transmitted as an opposite rotational driving force to each of the two driven shafts 3a, 3b through the meshed bevel gears 2, 5.6. The rotational driving force of the driven shaft 3a, which is rotationally driven in the clockwise direction, is transmitted as a rotational driving force in the counterclockwise direction to the turning shaft 9a shown on the left side through the spur gears 7 and 12. , and the rotational driving force of the other driven shaft 3b, which is rotationally driven in the counterclockwise direction, is generated by the spur gear 8.
, 13, the rotational driving force is transmitted in the clockwise direction to the pivot shaft 9b shown on the right side. In this way, the opposite rotational driving forces shown by the arrows transmitted from the respective turning shafts 9a and 9b are transmitted to the pair of meshed bevel gears 14 and 1, respectively.
9 and 15° 20 through each front wheel drive shaft 16'a, 1
6b is transmitted as a rotational driving force in the same direction as shown by the arrow. As a result, each planetary gear 25.25 of the front wheel support shaft 21.21 meshed with the sun gears 18a, 18b is aligned with the axis of each sun gear, that is, the front wheel drive shaft 16a,
It revolves around the axis of 16b in the same rotational direction as the front wheel drive shaft, thereby rotationally driving the front wheel 22 supported by the front wheel support shafts 21, 21.

Next, the operating state when the handle 10 is turned when the vehicle is stopped will be explained based on FIG. 2, which shows the operating state when the handle 10 is turned clockwise. When the handle 10 is rotated clockwise, the spur gears 12 and 13 fixed to the upper ends of the respective pivot shafts 9a and 9b are rotated into the respective spur gears 7 that mesh with the respective spur gears 12 and 13.
It revolves around °8 while rotating in the same direction of rotation as shown by the arrow. The pivot shaft 9a is rotated in the same direction of rotation.
, 9b is generated by a pair of meshed bevel gears 14, 1
Each front wheel drive shaft 16a, 16b via 9 and 15, 20
is transmitted as a rotational force in the opposite direction. As a result, each planetary gear 25, 25 only rotates at its meshing position and does not revolve, so the front wheel support is rotatably fitted into the fitting recesses 24, 24 formed in the hub 23 of the front wheel 22. Axis 2
1 and 21 are idly rotated within the fitting recesses 24 and 24, and therefore no rotational driving force is transmitted to the front wheels 22. Therefore, even if the steering wheel is turned when the vehicle is stopped, there is no problem with the front wheels.

It goes without saying that the front wheel drive system of the present invention is not only applicable to two-wheeled vehicles, but may also be employed, for example, to vehicles with two rear wheels and a single front wheel.

<Effects of the Invention> Since the front wheel drive system for a two-wheeled vehicle according to the present invention has the characteristic configuration and functions described above, it is possible to efficiently transmit rotational driving force from the engine to the front wheels. In addition, there is no problem that the front wheels rotate when the steering wheel is turned when the vehicle is stopped, and an effective front wheel drive system for a two-wheeled vehicle can be provided.

[Brief explanation of drawings]

Figures 1 and 2 are both longitudinal sectional front views of the front wheel drive system for a two-wheeled vehicle according to the present invention viewed from the direction of the riding position, with Figure 1 showing the operating state of the front wheel drive when running, and Figure 2 showing the front wheel drive system at rest. The operating conditions are shown when the steering wheel is turned to the right. 1...Input axis. 3a, 3b...Driven shaft, 4...Handle main shaft. 9a, 9b... Rotating axis. 16a, 16b...front drive shaft. 18a, 18b...Sun gear, 21...Front wheel support shaft, 22...Front wheel. 24... Fitting recess, 25... Planetary gear.

Claims (1)

[Claims] It consists of an input shaft to which rotational driving force from the engine is transmitted and a bevel gear fixed to the output end of the input shaft, and two shafts that are orthogonal to the input shaft and rotatable around the main shaft of the handle. A driven shaft having a bevel gear fixed to the upper end facing each other and meshing with the bevel gear, and a spur gear fixed to the lower end of each shaft, and a driven shaft that rotates around the handle main shaft as the handle rotates. Each pivot shaft is rotatably supported within a pair of rotatably configured cylindrical frames, and has spur gears meshed with the respective spur gears fixed to its upper end, and a bevel gear fixed to its lower end; It consists of two shafts rotatably fitted on the axles, with sun gears consisting of bevel gears fixed to opposite ends of the two shafts in an opposing state, and the above-mentioned shafts fixed to the lower ends of each rotating shaft at the other ends thereof. A front wheel drive shaft to which a bevel gear is fixed, which meshes with the bevel gear; one end of the shaft is rotatably fitted into a fitting recess formed on the inner circumferential surface of the front wheel hub, and the other end is fitted with each of the sun gears A front wheel drive system for a two-wheeled vehicle, characterized by comprising a front wheel support shaft to which a planetary gear consisting of a bevel gear is meshed with a fixed front wheel support shaft.