JP2500960Y2 - Front hawk device for motorcycles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a front hawk device for a motorcycle.

[Prior Art] In the front hawk of a motorcycle, the left and right hawks are made of an outer tube and an inner tube, and the inner tube is slidably inserted into the outer tube so that it can be expanded and contracted for cushioning. And
The inner tube on the upper side is called an upright type, and the outer tube on the upper side is called an upright type. In the inverted type, as shown in FIG. 5, the center of the upper and lower brackets A is attached to the head pipe C of the frame by the steering shaft B so that the head pipe C can be rotated and steered, and the slits provided on both sides of the upper and lower brackets A are provided. The upper part of the outer tube E is inserted into the mounting hole D, and the mounting hole D is tightened with bolts for mounting. Then, the inner tubes are slidably inserted under the left and right outer tubes E so as to expand and contract, and the front wheels are rotatably supported by the axle fittings attached to the lower ends of the left and right inner tubes. Both ends are attached. This inverted front hawk has the advantage that the unsprung weight is light and the cushioning performance is good. As an example of mounting the outer tube or inner tube of the bracket, see
See JP-A-60-72789 and JP-A-62-283088.

[Problems to be solved by the device]

However, in the inverted front hawk, as shown in FIG. 5, the upper portion of the outer tube E is passed through the mounting holes D of the upper and lower brackets A, and the mounting holes D are tightened inward by bolts for mounting. In this case, the inner tube slides on the inner side of the outer tube E, and when the outer tube E is tightened with a strong bolt, deformation occurs, which hinders the sliding of the inner tube. For this reason, the outer tube E is provided with a retaining collar F, which is brought into contact with the bracket A to prevent retaining, and the tightening force of the mounting hole D is set to an appropriate strength without deformation. However, since the tightening force is not strong, there is a disadvantage that the outer tube is twisted in the case of cornering and the maneuverability is deteriorated.

In view of this point, this invention is designed to tighten the upper parts of the left and right inverted outer tubes into the mounting holes of the upper and lower brackets. An object of the present invention is to obtain a front hawk device for a motorcycle in which no twist occurs.

[Means for solving the problem]

In order to achieve the above object, a front hawk device for a motorcycle according to the present invention is provided with upper and lower brackets whose center is rotatably attached to a head pipe of a frame by a steering shaft, and slits provided on both sides of the upper and lower brackets. Insert the upper parts of the left and right outer tubes into the mounting holes and tighten the mounting holes to mount the outer tube.In this case, provide a protrusion with a flat surface on one side of the mounting hole of the lower bracket, The retaining bracket is provided at a lower position of the side bracket, and a flat notch is provided on one side of the retaining flange so as to be in contact with the plane of the protrusion.

[Action]

In the present invention having the above-mentioned configuration, the outer tube is inserted into the mounting holes of the upper and lower brackets and is tightened with an appropriate tightening force that does not cause deformation. Even if the tightened bolt may loosen due to vibration of the frame, etc., the outer tube can be pulled out with the retaining brim and will not come off. Further, since the outer tube has the flat surface of the protrusion of the bracket contacted by the flat notch of the retaining collar and is stopped in the rotational direction, the outer tube is not twisted, and the traveling property such as cornering is improved.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

First, the inverted front hawk of the motorcycle will be described. The upper and lower brackets 1 are attached to the head pipe 3 of the frame so that they can be steered by the steering shaft 2 at the center. On both sides of the upper and lower brackets 1, vertical mounting holes 5 having slits 4 are provided. The outer tubes 6 on the left and right pass through the mounting holes 5 of the upper and lower brackets 1, and the slits 4 are fixed by bolts 7.
Tighten with. The left and right outer tubes 6 are inserted inside the left and right outer tubes 6 so that the left and right inner tubes 8 can slide from the lower ends to expand and contract. Both ends of an axle 11 rotatably supporting a front wheel 10 are attached to axle metal fittings 9 connected to the lower ends of the left and right inner tubes 8. Therefore, in the present invention, the protrusion 13 having the flat surface 12 is provided at the lower end on one side of the mounting hole 5 of the lower bracket 1. The protrusion 13 may be integrally cast with the bracket 1 as shown in FIGS. 1 and 2, or the separately provided protrusion 13 may be screwed to the bracket 1 as shown in FIG. is there. On the other hand, the left and right outer tubes 6 are provided with retaining collars 14 at locations that are the lower side portions of the lower bracket 1. And the retaining collar 14
A plane notch 15 is provided on one side.

The retaining collar 14 contacts the lower surface of the lower bracket 1,
When the tightening bolt 7 is loosened, it prevents the outer tube 6 from moving in the axial direction. Further, the flat surface notch 15 provided on one side of the retaining collar 14 is a flat surface of the protrusion 13 provided on the bracket 1.
Since it is in contact with 12, the outer tube 6 can be prevented from rotating and twisting can be prevented.

[Effect of device]

As described above, since the present invention is configured as described above, it is possible to properly tighten the outer tube, prevent deformation, and obtain a smooth stretchable cushion for the inner tube. The outer tube is prevented from moving in the axial direction by a retaining collar, and the flat tube notch and the flat surface of the projection are brought into contact with each other to stop the movement of the outer tube in the rotating direction and prevent twisting. This stabilizes maneuverability such as cornering.

[Brief description of drawings]

FIG. 1 is a front view of an essential part showing an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same part, and FIG. 3 is a perspective view of an essential part showing another embodiment of the present invention. 4 is an overall side view of the same, and FIG. 5 is a partial front view showing a conventional example. 1 ... Bracket, 2 ... Steering shaft, 3 ...
… Head pipe, 4 …… Slit, 5 …… Mounting hole, 6
…… Outer tube, 12 …… Plane, 13 …… Projection, 14…
… Detachment collar, 15… Flat cutout.

Claims (1)

(57) [Scope of utility model registration request] 1. An upper and lower bracket whose center is rotatably attached to a head pipe of a frame by a steering shaft is provided, and upper and left outer tube upper portions are inserted into attachment holes with slits provided on both sides of the upper and lower brackets for attachment. For tightening the hole to attach the outer tube,
A protrusion having a flat surface is provided on one side of the mounting hole of the lower bracket, a retaining collar is provided at a lower position of the bracket on the lower side of the outer tube, and a flat notch is provided on one side of the retaining collar. A front hawk device for a motorcycle, wherein the front hawk device is provided so as to be in contact with the plane of the protrusion.