JPS62194988A - Swing arm type front-wheel suspension system 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 (Field of Industrial Application) The present invention relates to a swing arm type front wheel suspension system for a motorcycle.

(Prior art) The iii wheel is supported in a cantilevered manner via the axle support part of the knuckle, the upper swing arm and the lower swing arm are extended forward from the middle part of the vehicle, and the front end of the upper swing arm can be steered by the knuckle. Japanese Patent Publication No. 58-4943 discloses a swing arm type front wheel suspension system for a motorcycle in which the front end of the lower swing arm is steerably pivoted to the knuckle below the upper swing arm and near the axle support part.
Already known as No. 5.

(Problems to be Solved by the Invention) In Japanese Patent Publication No. 5B-49435, the front end of the lower swing arm is steerably pivoted below the axle support portion of the knuckle and at the lower edge of the knuckle.

If you try to pivot the front end of the lower swing arm near the axle support part at the knuckle and on one side of the axle support part in order to increase the steering angle of the front wheels, the joint member etc. at the front end of the lower swing arm will interfere with the knuckle. In order to prevent this, the offset Ti between the steering axis and the axle cannot be made small, and there is a problem in that there are restrictions when setting the alignment of the front wheels such as caster trails.

The present invention has been devised in view of the above-mentioned circumstances, and the object of the present invention is to: To provide a swing arm type front wheel suspension system for a motorcycle that can reduce the amount of offset between a steering axis and an axle and is advantageous in setting seven alignments of the front wheel.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a portion (45) of the knuckle (17) that is offset forward of the axle support (33) above the axle support (33). )
a deflected portion (45) of the knuckle (17);
The front end (25A) of the lower swing arm is pivotally supported above the axle support part (33) at the rear of the swing arm.

(Function) At the rear of the deflected portion (45) and at the axle support portion (3
On the - side of 3), the lower swing arm front end (25A) can be pivoted without interfering with the knuckle (17). Therefore, the offset between the steering axis (K) and the axle (15), f
l(e) can be made small, which is advantageous in setting the alignment of the front wheels (13).

(Embodiment) A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic side view of the front wheel suspension system, and FIG. 2 is an enlarged side view of the main parts thereof.

(1) is a motorcycle, and the body frame (3) of the motorcycle (1) includes lower frames (7), (7) connected to the left and right sides of an engine (5), and lower frames (7), (7)
and an upper frame (8) extending forward and backward above the lower frame (7) and coupled to the lower frame (?), the upper frame (8)
Attach accessories such as the handle (11), fuel tank, and seat to.

The axle (15) of the front wheel (13) is supported by the knuckle (17), and a support shaft (19) is attached to the front part of the lower frame (7).
, (21), the upper swing arm (23) and the lower swing arm (25) are extended forward through the knuckle (21).
17) The front wheel (13) is suspended and supported in a leading manner via the upper and lower swing arms (23) and (25).

The lower swing arm (25) and the lower frame (7) are connected via a buffer (27) and a progressive link mechanism (29), and the knuckle (17) and the upper swing arm (2
3), a lower swing arm (25), and a lower frame (7) constitute a link mechanism (31).

As shown in Fig. 4, the knuckle (17) is located on the inside of the front wheel (13) and is attached to the axle (15) when viewed from the rear of the vehicle.
an axle support part (33) that supports the front wheel (13); and an extension part (35) that extends in the L direction while curving outward to prevent interference between the axle support part (33) and the front wheel (13); It consists of an upper swing arm coupling part (37) for attaching the upper swing arm (23) located above the front wheel (13) at the upper end of the extension part (35).

Further, as shown in FIG. 3, the knuckle (17) is located at the upper swing arm coupling portion (37) when viewed from the side of the vehicle.
A straight part (41) in which the road half of the extending part (35) extends straight along the steering axis (K), an axle support part (33) and an upper swing arm coupling part (37). ), and the lower end of the straight part (41) and the upper end of the offset part (45) are connected to the curved part (4).
7) and an inclined portion (51) connected via (49).

Then, at the F part of the axle support part (33), the deflection part (4
5) A lower swing arm joint portion (53) is formed in a bulge at the rear of the lower swing arm joint portion (53).

Furthermore, a gear box (55) for mounting a speedometer is formed on the outer side of the axle support part (33), and a gear box (55) for mounting a speedometer is formed on the outer side of the axle support part (33). Brackets (57) and (59) are provided to protrude from the lower end of the straight portion (41), and a bracket (81) is provided to protrude outward from the lower end of the straight portion (41).

The upper swing arm coupling portion (37) of the knuckle (17)
) is joined) (63), and the front end (23A) of the upper swing arm is pivotally supported via a bolt ([15) so as to be steerable.

The lower swing arm connecting portion (53) of the knuckle (17)
), the lower swing arm front end (25A) is pivotably supported via a lower joint (67) and a bolt (69) so as to be steerable, as shown in FIG.

The joints (83) and (87) are specifically bolts (
85).

(69) constitutes the steering axis (K), and the steering axis (
K) focuses on vehicles! a (71), and the steering axis (K) is offset by a distance (e) behind the axle (15).

Steering of the front wheels (13) is performed by steering the front wheels (13) together with the knuckles (17) about the steering axis (K) via the steering link mechanism (73) by operating the handle (11).

The 111th steering link mechanism (73) includes a bell crank (75) that is pivotally supported on the lower frame (7), and a tenth joint (79) that connects the steering stem (77) and one end of the bell crank (75). , the 20th joint (81) connecting the other end of the knuckle (17) and the bell crank (75).
), and the 1111 end of the 20th rod (81) is connected to the bracket (ill) via a joint (83) or the like.

As shown in Fig. 5, the maximum steering angle of the front wheels (13) is determined by an elastic material (87) such as rubber attached to the front part of the axle support part (33) and the bulge part (85) of the knuckle (17). ), (8
7) on the inclined surface (89) of the lower swing arm front end (25A).
), (89).
) is the knuckle when steering to the left, (B) is the knuckle when steering to the right (17)
Indicates the location of

The gear box (55) of the knuckle (17) has a pinion (93) connected to the speedometer cable (91).
), and the pinion (83) is meshed with a gear (95) integrally connected to the axle (15).

The brake caliper (97) is attached to the above bracket) (57)
.

(59) to the knuckle (17), as shown in the figure (9).
7A) indicates a brake disc. In the embodiment, the deflection part (45) of the knuckle (17) is bulged out in front of the axle (15), so the brackets (57) and (59) are different from the conventional one with respect to the brake disc (9?A). Because it is closer to the tangential direction than that of
, (59) can be shortened, which is advantageous when receiving brake reaction force. In particular, as in this example, the brake disc (
97A) When a brake pad (not shown) having a length in the circumferential direction is provided Since the caliper (87) is arranged along the circumferential direction of the brake disc (97A),
In particular, the bracket (57) can be shortened.

The present embodiment is configured as described above, and the knuckle (17) is provided with a deflection portion (45), and the deflection f in the knuckle (17) is
Since the lower swing arm front end (25A) is pivoted above the axle support part (33) behind the fl (45),
Knuckle (17) at the front end of the lower swing arm (25A) at a more forward location without interfering with the knuckle (17)
Therefore, the axle (15) and steering axis (K)
For example, the deviation amount (e) between the front wheels (13 ) can increase the degree of freedom in alignment settings. In addition, in this embodiment, the axle (1
5), the steering axis (K) is arranged at the rear to make the deviation amount (e) a positive value, but by providing the deviation part (45) further forward, the deviation amount (e) can be increased. Negative value.

That is, the steering axis (K) can also be arranged in front of the axle (15). Furthermore, since a join (87) can be placed near the axle (15), the axle (15)
The distance between the front wheel (1) and the joint (67) can be reduced.
It is advantageous in terms of rigidity when the lower swing arm (25) receives the input (external force) from 3).

(Effects of the Invention) As is clear from the following explanation, according to the present invention, when the lower swing arm is pivotally supported in the vicinity of the axle support portion at the knuckle so as to be steerable upward, the alignment of the front wheel is set. : It is advantageous.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of the front wheel suspension system, Fig. 2 is an enlarged side view of the main parts, Fig. 3 is a side view of the knuckle, Fig. 4 is a rear view of the knuckle, and Fig. 5 is the same as Fig. 2. It is a v-vl sectional view. In the drawings, (1) is a motorcycle, (13) is a front wheel, and (1) is a motorcycle.
5) is axle, (17) is ner, barrel, (23) is -
His swing arm, (25) is the lower swing arm, (3
3) is an axle support part, and (53) is a lower swing arm connection part. Patent applicant: Agent for Honda Motor Co., Ltd.
Patent Attorney Part 2 1) Part 1 Patent Attorney
Kuni Ohashi Production volume Patent attorney Small
Udo Yama Patent Attorney No 1)
Shigeru Figure 3 Figure 4

Claims (1)

[Claims] The front wheel is supported in a cantilevered manner via the axle support part of the knuckle, and the upper swing arm and lower swing arm extend forward from the middle part of the vehicle, so that the front end of the upper swing arm can be steered by the knuckle. In the swing arm type front wheel suspension system for a motorcycle, the front end of the lower swing arm is steerably pivoted to the knuckle below the upper swing arm and near the axle support part, the axle support part of the knuckle. A motorcycle characterized in that a portion of the knuckle that is offset toward the front of the axle support portion is provided above the knuckle, and the front end of the lower swing arm is pivotally supported above the axle support portion of the knuckle. swing arm type front wheel suspension system.