JPS62191288A - Front-wheel steering gear for motorcycle - 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] (Industrial application field) The present invention relates to a front wheel steering device for a motorcycle.

(Prior Art) A motorcycle in which a front wheel is rotatably supported by a knuckle arm, the knuckle arm is suspended via a swing arm extending forward from the middle part of the vehicle, and the handlebar and the front wheel are connected by a steering link mechanism. A front wheel steering device is already known, for example, as disclosed in Japanese Patent Application Laid-open No. 57-15087.

(Problems to be Solved by the Invention) However, in such a conventional 1i-wheel steering device, no stopper is provided to limit the maximum steering angle of the front wheels, and therefore, when the maximum steering angle is reached, the rods, levers, etc. of the steering link mechanism, This places a large burden on joints, etc.

The present invention has been devised in view of the above circumstances, and an object of the present invention is to reduce the load placed on the rod, lever, joint, etc. of the steering link mechanism when the front wheels are at the maximum steering angle, and to reduce the burden on these members. An object of the present invention is to provide a front wheel steering device for a motorcycle, which can reduce the weight of the motorcycle.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a steering system member (91) that connects the steering wheel (11) and the front wheels (13) and includes a steering link mechanism (97);
Stoppers (121) and (181) that come into contact with the wheels (17) and limit the maximum steering angle of the front wheels (13) are provided on the non-steering system members (53) and (21).

(Function) The maximum steering angle of the front wheels is limited by the stoppers (121) and (161), and the load at the maximum steering angle is reduced by the stoppers (121) and (161).
181).

(Embodiment) Hereinafter, a preferred embodiment of the invention will be described with reference to the accompanying drawings.

Figure 1 is a cross-sectional side view of the main part of the front part of a motorcycle, Figure 2 is a cross-sectional view corresponding to line II-II in Figure 1, Figures 3 and 4 are respectively viewed from the ■ arrow in Figure 2, and ■ An arrow view is shown.

(1) is a motorcycle, and the body frame (3) of the motorcycle (1) extends back and forth between a lower frame (7) arranged on the side of the engine (5) and above the lower frame (7). It consists of an upper frame (8) connected to a lower frame (7), and accessories such as a handle (11), a fuel tank, and a seat are assembled to the upper frame (8).

The axle (15) of the front wheel (13) is attached to the knuckle arm (1
7), and the knuckle arm (17) is supported in a leading manner so as to be steerable through a swing arm (18) extending from the lower frame (7). ) consists of an upper arm (18) and a lower arm (21).

The knuckle arm (17) has a lower end (17A) that supports the axle (15) inside the front wheel (13), and an extension part that extends upward from the lower end (17A) and toward the outside of the front wheel (13). (17B), and an upper end portion (17G) located diagonally above the front wheel (13) at the upper end of the extension portion (17B).

The upper and lower arms (19) and (21) have their bases pivotally connected to the lower frame (7) via shafts (2a) and (25), respectively, and have two shafts (27) and (29) intersecting at their tips. (
31) and (33) respectively to the knuckle arm (17).
It is connected to the upper end (17G) and lower end (17A) of the.

The force axes (29) and (33) are arranged on the same axis, and a steering axis (35) is formed by the axes (29) and (33), and the lower frame (7), the upper A parallel movement mechanism (37) is configured by the lower arms (19), (21) and the knuckle arm (17).

FIG. 5 shows a cross-sectional plan view of the lower arm (21) and knuckle arm (17) in a coupled state.

One of the shafts (31) is a lower joint (31) that extends in the vehicle width direction, and the shaft portion of the lower joint (31) (
31A) is supported at the tip of the lower arm (21) via bearings (151) and (153), and lower joint h (31
) is connected to the lower part (17A) of the knuckle arm (17) via the shaft (33), and the center of the shaft (33), that is, the steering axis (35) is aligned with the vehicle width center (155). position it above.

The shaft (in) at the lower part of the knuckle arm (17A)
Elastic members (159) and (159) are attached to the front and rear parts of 33) through screws (15?), respectively. The elastic material (15
9) was formed using iron rubber in the example. The elastic material (159) is attached to the front and rear of the portion (21A) of the lower arm (21) facing the knuckle arm (17) side.
, (159) consisting of an inclined surface that can freely come into contact with the stopper (
IEII) and (181) are provided, and one elastic member (159) and the front stopper (iet) are brought into contact with each other when steering to the left, as shown by the actual line (A), and as shown by the imaginary line (B). When steering to the right, the other elastic member (159) and the rear stopper (161) are brought into contact with each other, and the maximum steering angle of the front wheels (13) is limited by the stoppers (181) and (181), and the steering angle is kept within a predetermined range. Set to .

Between the lower arm (21) and the lower frame (7) is a progressive link 4 consisting of links (39) and (41)!
4W (43) is provided, and a progressive link mechanism (43) is provided.
) and the lower frame (7), and the front fender (47) is attached to the knuckle arm (17).

The handle (11) has left and right handle pipes (49).
, (49), and a hollow steering stem (5
1) Attach the inner ends (49A') and (49A) of the handle pipes (49) and (49) to the upper part of the handle pipes.

The steering stem (51) is connected to the handle post (5
3), and the handle boss) (53) is a bracket at the front end of the seventh frame (9).

The bracket (55) includes two support plates (57) and (59) spaced apart in the vehicle width direction, and the right support plate (59) has a large vertical width.

A step portion (69) protruding toward the steering stem (51) is formed at the lower end of the support plate (59).
A recess (63) is formed in the longitudinal center of 61).

As shown in FIG.
The front and rear surfaces (613) and (71
) is formed into a rectangular shape in plan view.

A steering stem insertion hole (73) is vertically provided in the center of the steering wheel boss (53), and a chain hole (73)
) The steering stem (51) is rotatably supported by bearings (75), (75) fitted above and below.

The handle boss (53) engages the retaining convex portion (77) vertically provided from the right surface (67) side with the concave portion (63), so that the engaging convex portion (77) and the concave portion (63) engage with each other. It is incorporated into the bracket (55) so that the tilt can be adjusted in the longitudinal direction of the vehicle with the center as the tilting center (79).

A hole (81) is formed through the steering stem (51) in the vehicle width direction at the front and back of the steering stem (51) in the handle boss (53).
'), (81), and each support plate (57), (
Long grooves (83) formed in an arc shape around the tilting center (79) in (59), bolts (85) in (83), (85)
) and then tighten the handle post (53) and E! (87) and (87). l] Handle (
11) to the upper frame (8) at a desired angle.

A bolt (8) is attached to the lower end of the steering stem (51).
9) to split and fix the arm (91).

The arm (81) is made to protrude to the left side of the vehicle, and holes (93) are formed in the arm (91) for weight reduction, and a collar is provided between the arm (81) and the bearing (75). (9
5).

Steering of the front wheels (13) by operating the handle (11) is performed by a steering link mechanism (97) that connects the steering stem (51) and the knuckle arm (17). The steering link mechanism (97) is connected to the arm (
91), a bell crank (101) pivotally connected to the lower frame (7) via a support shaft (89), and a bell crank (1
A rod (103) that connects one end (totA) of 01) to the arm (81), and a rod (105) that connects the other end (101B) of the bell crank (101) and the knuckle arm (17), Each rod (103), (1
05) are provided with joints at both ends and are connected to corresponding members.

As shown in FIGS. 1 and 4, when viewed from the side of the vehicle, the connecting point (
10? ) and the tilting center (79) of the steering wheel (11) when viewed from the side of the vehicle, and when adjusting the tilting of the steering wheel (11), the rod (1) of the steering link mechanism (97)
03), (105) to eliminate the need for length adjustment work, etc.

A brake hose (109), a clutch hose (111), and a wire harness (113) are inserted into the inside of the steering stem (51), and the brake hose (109) and clutch hose (111) are inserted into the steering stem (51). A flare pipe (117) is inserted through joints (115) and (115).
), and (119) in the figure indicates the clutch lever.

Stoppers (121) and (121) are vertically installed from the front and back of the lower surface of the handle boss (53), and the arm (81)
) by bringing the base portions (91A), (91A) into contact with the stoppers (121), (121), the maximum steering angle of the handle (11) is limited, and the steering angle is set within a predetermined range.

This embodiment is configured as described above, so the front wheel (13)
The maximum steering angle of is limited by the stoppers (121), (121) or the stoppers (181), (181).

The rod (1) that constitutes the steering link mechanism (θ7)
03), (105), the lever (101), the joint, etc., and the weight of these members can be reduced.

Further, since the structure is constructed using steering system members that move during steering and non-steering system members that do not move during steering, the above effects can be achieved while suppressing an increase in the number of parts.

In addition, in the embodiment, the arm (
Since the stoppers (121) and (121) that are in contact with the handlebars (121) and (121) are provided, when the steering wheel (11) is at its maximum steering angle, the steering force from the handlebar (11) is transferred to the stoppers (121) and (121).
1) receives the steering force from the handle (11).
103), bell crank (101), rod (105)
) to prevent transmission to the knuckle arm (17) side.

In addition, a stopper (181) is attached to the lower arm (17).
181), the front wheels (181) are installed at the maximum steering angle.
3) External force rod (105), bell crank (
101), rod (105), and prevent transmission to the arm (81) side. In the embodiment, the stopper (11111) near the front wheel (13) is first brought into contact with the elastic material (159).
Within the elastic range of , the stopper (121) next closest to the handle (11) is supported so that no excessive load is placed on the joint.

(Effects of the Invention) As is clear from the above description, according to the present invention, it is possible to reduce the load placed on the rod, lever, joint, etc. of the steering link mechanism when the front wheels are steered at the maximum angle, and to reduce the weight of these members. This reduces vehicle weight and steering inertia, making it easier to operate the steering wheel.

[Brief explanation of drawings]

Figure 1 is a cross-sectional side view of the main part of the front part of a motorcycle, Figure 2 is a cross-sectional view corresponding to line II-II in Figure 1, Figures 3 and 4 are respectively viewed from the ■ arrow in Figure 2, and ■ The arrow view and FIG. 5 are cross-sectional plan views of the lower arm and knuckle arm in a coupled state. In addition, (1) in the drawing is a motorcycle, (11) is a handle,
(13) is the front wheel, (17) is the knuckle arm, (5
1) is the steering stem, (53) is the handle post, (91) is the arm, and (87) is the steering link mechanism. (121) and (181) are stoppers.

Claims (3)

[Claims] (1) A front wheel of a motorcycle in which the front wheel is rotatably supported by a knuckle arm, the knuckle arm is suspended via a swing arm extending forward from the intermediate portion of the vehicle, and the handlebar and the front wheel are connected by a steering link mechanism. In the steering device, a stopper that connects the handle and the front wheels and comes into contact with a member of the steering system including the steering link mechanism to limit the steering angle of the front wheels;
A front wheel steering device for a motorcycle, characterized in that it is provided on a non-steering system member. (2) The front wheel steering device for a motorcycle according to claim 1, wherein the stopper is provided at the front part of the swing arm so as to be able to come into contact with the knuckle arm. (3) The steering stem of the handle is rotatably supported by a handle post connected to the vehicle body, and an arm constituting a steering link mechanism is provided protruding from the lower part of the steering stem, and the stopper is in contact with the arm. A front wheel steering device for a motorcycle according to claim 1, wherein the front wheel steering device is provided on a handlebar post so as to be freely accessible.