JPH01115791A - Motorcycle - Google Patents

Abstract

PURPOSE: To miniaturize a hydraulic steering system by providing a pair of right and left steering handles on a base frame for steering provided on a vehicle body main body so as to slide forward and backward freely and providing a hydraulic cylinder unit on drive side on this base frame. CONSTITUTION: A square base frame 20 for steering is provided in an upper part of a vehicle body main body in a motorcycle through a stay. Right and left steering handles 23, 24 are provided on side frames 20a, 20b of the base frame 20 through guide rails 21, 22, respectively, so as to slide freely along forward and backward directions. Both handles 23, 24 are connected through wires 25, 26, and both handles 23, 24 can be relatively and freely displaced by the same distance in the opposite directions mutually. A hydraulic cylinder unit on drive side 30 consisting of a control valve 40, an assist cylinder 50, and a drive cylinder 60 which are constituent elements of a hydraulic steering system 100 is arranged in this base frame 20.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a motorcycle, and more particularly to a hydraulic steering system for a motorcycle.

[Prior art]

2. Description of the Related Art Recently, several motorcycles have been provided that are configured to transmit the movement of a steering wheel to the wheels via a hydraulic system in order to reduce the burden on the rider during steering operations.

By the way, the above hydraulic system (hydraulic steering system) is
The hydraulic system is composed of many parts, including an oil pump, control valve, assist cylinder, and drive cylinder, which has led to the increase in the size of motorcycles equipped with the above-mentioned hydraulic system.

[Purpose of the invention]

In view of the above-mentioned circumstances, it is an object of the present invention to provide a motorcycle that is equipped with a hydraulic system and that can be made as compact as possible.

[Structure of the invention]

Therefore, in the present invention, a base frame for steering is provided on the vehicle body, and a pair of left and right steering handles are disposed on the base frame so as to be slidable along the longitudinal direction of the vehicle body. In a hydraulic steering system, by disposing a drive-side hydraulic cylinder unit composed of a control valve, an assist cylinder, and a drive cylinder, space can be used effectively, thereby achieving the above object.

〔Example〕

Hereinafter, the present invention will be explained based on the drawings.

FIG. 3 shows a motorcycle related to the present invention. In this motorcycle 1, a front swing arm 3 is supported in front of an engine 2 (left side in the figure), and a front wheel 5 is supported at the free end of the swing arm 3 via a hub center mechanism 4, which will be described later. ing. On the other hand, behind the engine 2, a rear swing arm 7 having a free end that pivotally supports a rear wheel 6 is supported, and the engine 2, front swing arm 3, etc. constitute a vehicle body 10.

A base frame 20 for steering is installed above the vehicle body 10 via stays 15.15.

As shown in FIG. 1, this base frame 20 has a square frame shape, and the side frames 2 of the base frame 20 are
0a and 20b, a right steering handle 23 (hereinafter referred to as right handle 23) and a left steering handle 24 (hereinafter referred to as left handle 24) are connected to the front and rear of the vehicle via guide rails 21 and 22, respectively. It is provided so as to be slidable along the direction. Also, both handles 2
A wire 25.26 is moored between 3.24 and
This causes both handles 23, 24 to slide relative to each other by the same distance in opposite directions.

Further, a drive-side hydraulic cylinder unit 30, which will be described in detail later, is installed on the base frame 20. Hydraulic oil pipe 70 extending from this hydraulic cylinder unit 30
．． 71 is connected to a driven cylinder 80, as shown in FIG.

The driven cylinder 80 is an element for driving the front wheel 5 via the hub center mechanism 4.

Here, the hub center mechanism 4 will be briefly explained.

As shown in FIG. 4, in the hub center mechanism 4, a hub 4C is installed at the center of a wheel 4a that holds the front wheel 5 via a bearing 4b, and an axle shaft 90 is loosely fitted into the hub 4c. ing.

Further, the hub 4c is supported by a stem shaft 91 of an axle shaft 90 so as to be freely drivable. The driven cylinder 8 described above is located between the hub 4C and the axle shaft 90.
0 is interposed, and the rod 8 in the cylinder 80
The distal end portion of the cylinder body 82 is bolted to a bracket 4d provided on the hub 4c, while the cylinder body 82 is pivotally supported by a holder 90a provided on an axle shaft 90. Due to the expansion and contraction operation of the driven cylinder 80, the hub 4
In other words, the front wheel 5 is driven around the stem shaft 91 via the hub 4 and the wheel 4a, as shown by arrows R and D in the figure.

Note that the axle shaft 90 is installed via a bearing 93 on a support shaft 92 installed on the front swing arms 3, 3.
Due to the action of the parallel link 95 (FIG. 3), which is one of the elements, the axle shaft 90 only rotates by a small angle relative to the drive of the swing arm 3.

The drive-side hydraulic cylinder unit 30 includes a control valve 40, an assist cylinder 50, and a drive cylinder 60, which are components of the hydraulic steering system 100, which will be described in detail later. The control valve 40 is composed of a 4-port switching valve, the assist cylinder 50 is a double-acting piston type, and the drive cylinder 6o
consists of a double moving rod type cylinder actuator. As clearly shown in FIG. 1, the valve 40,
and cylinder 50.60 are both handle 23.24
The rod 41 of the control valve 40 is linked to the arm portion 24a of the left handle 24. In addition, the assist cylinder 50
The one side rod 51 and the other side rod 52 are fixed to the front frame 20c and the rear frame 20d of the base frame 20, respectively, and the rod 61 of the drive cylinder 60 is fixed to the front frame 20c of the base frame 20. It is set up. Further, the body 42 of the control valve 40 and the bodies 5B and 62 of both cylinders 50 and 60 are integrally assembled with each other, and the valve 40 and the cylinder 50
, and the cylinder 50 and cylinder 60 are each body 4
They communicate with each other via oil passages (not shown) formed in the 2,53° 62. In this way, the valve 40
By integrally configuring the and cylinders 50, 60 and installing them on the base frame 20, both handles 23.
24 spaces can be used effectively. Furthermore, piping work between the valve 40 and the cylinders 50, 60 is not required.

FIG. 2 shows the hydraulic steering system 100.

The system 100 includes the above-mentioned drive-side hydraulic cylinder unit 30, hydraulic oil pipes 70 and 71, and the driven cylinder 80, an oil tank 110, an oil pump 120,
It is comprised of an electromagnetic valve 130, a controller 140 that operates the electromagnetic valve 130 based on vehicle speed, and the like. Note that 141 is a power source, 142 is vehicle speed data, and 31 is a reservoir tank assembled to the drive-side hydraulic unit 30.

Now, in order to turn the vehicle to the right, turn the right steering wheel 23.
When the left handle 24 is slid toward the rear of the vehicle body and the left handle 24 is slid toward the front of the vehicle body to the position shown by the broken line in FIG. 2, and the spool 43 of the control valve 40 is moved to the left.
The hydraulic oil in the oil tank 110 is transferred to the oil pump 120.
As a result, the oil is supplied to the front side oil chamber 50a of the assist cylinder 50. As a result, the body 53 of the assist cylinder 50 moves to the left, and the body 62 of the drive cylinder 60 moves to the left.
moves to the left together with the body 53. When the body 62 moves to the left, from the rear oil chamber 60a of the drive cylinder 60,
Hydraulic oil is supplied to the rear side oil chamber 80a of the driven cylinder 80 through the hydraulic oil pipe 70, the rod 81 extends, and the front wheel 5 is driven to the right of the vehicle body as shown by mark R in FIG. When each body 42, 53, 62 of the unit 30 moves to the left and the spool 43 moves to the right with respect to the valve body 42, the spool 43 reaches a neutral position and each body 42 moves to the left.
．． 53.62 will stop. When the spool 43 is moved to the right via the left handle 24, the body 53 of the assist cylinder 50 and the body 62 of the drive cylinder 60 are moved to the right by the hydraulic oil supplied to the rear oil chamber 50b of the assist cylinder 50. Front oil chamber 60a of drive cylinder 60
Hydraulic oil is supplied to the front side oil chamber 80b of the driven cylinder 80 through the hydraulic oil pipe 71, and the driven cylinder 8
0 rod 81 retracts. Thus, the front wheels 5 are driven to the left of the vehicle body as shown by the arrow in FIG. 4, and the vehicle body turns to the left. Further, each body 42, 53, 62 stops when the spool 43 reaches the neutral position after moving to the right.

The electromagnetic valve 130 is generally well known as a device that operates in response to a command from a control 140 based on vehicle speed data 142 and generates a steering force for the steering wheel corresponding to the vehicle speed.

〔Effect of the invention〕

As described above in detail, according to the motorcycle according to the present invention, the control valve, the assist cylinder, and the drive cylinder in the hydraulic steering system constitute the drive-side hydraulic unit, and the drive-side hydraulic unit supports the steering handle. Since it is installed on the base frame for the steering wheel, space can be used effectively, and as a result,
It has become possible to make motorcycles as small as possible.

[Brief explanation of the drawing]

FIG. 2 is a piping system diagram of the hydraulic steering system, FIG. 3 is an overall side view showing the main components of the motorcycle, and FIG. 4 is a diagram of the hub center mechanism that supports the front wheel and the driven cylinder. FIG. 3 is a cross-sectional plan view of main parts showing an installation mode. 1... Motorcycle, 20... Base frame, 23
...Right-hand drive, 24...Left-hand drive, 30...
Drive side hydraulic cylinder unit, 40... Control valve, 50... Assist cylinder, 60... Drive cylinder, 70.71... Hydraulic oil pipe, 80... Driven cylinder, 100... Hydraulic steering system. Applicant Suzuki Automobile Industry Co., Ltd.

Claims (1)

[Claims] A base frame for steering is provided on the vehicle body, and a pair of steering handles located on the left and right sides of the vehicle body are disposed on the base frame so as to be individually slidable along the longitudinal direction of the vehicle body, and A two-wheeled motor vehicle is provided with a hydraulic steering system between a steering handle and a wheel to drive the wheels to steer the vehicle body based on the operation of the steering handle, the control valve in the hydraulic steering system; A motorcycle characterized in that a drive side hydraulic cylinder unit is constituted by an assist cylinder and a drive cylinder, and the drive side hydraulic unit is installed on the base frame.