JPS61202995A - Under-guard device for front wheel driving system - 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 (Technical Field) The present invention relates to an underguard device that protects the lower surface of a front wheel drive system on the front fork side of a vehicle such as a motorcycle or tricycle that employs a front wheel drive system.

(Prior art) Such vehicles, etc. are as already proposed (Patent Application, 1982-1).
No. 56596, an abbreviation is shown in FIG. ) The front fork 50 pivotally supported at the front of the vehicle body is powered by a front wheel drive device 70 disposed on a stabilizer 53 that connects the upper inner sides of the left and right bottom cases 51, respectively, and a power unit P mounted on the vehicle body side. The front wheel drive device 70 is rotatably connected to a shaft drive mechanism 71 passing over the top, and this front wheel drive device 70 is connected to a pair of bevel gears -G.
1 and G2 to rotate a lateral drive shaft 54 arranged in the direction of the inside of the vehicle, and a drive sprocket 55 and a front wheel W that are fixed to the lateral drive shaft 54.
An endless chain 5 or the like is suspended between the f-side driven sprocket 56 and the power of the power unit P is thus transmitted to the front wheels without any trouble.

The front fender 72 has a hollow hole 73 through which the shaft drive mechanism 71 serving as the front wheel drive system passes, and
f and the stabilizer 53 so as to cover the front wheel drive device 70, and are fixed to the bottom case 51 side. On the other hand, the underside of the front wheel drive system is bare, with no protective material and is placed directly facing the front wheels.

(Problems with the Prior Art) When the front wheels Wf are driven with the above-mentioned configuration, sand, mud, water, etc. that are scattered during driving are deposited on the constant velocity joint 75 and drive shaft 76 that constitute the upper front wheel drive system as shown by the arrow. Hit,
This has caused problems such as damage and getting into each bearing part, significantly accelerating wear. This is a problem that reduces the durability of the power transmission system, making it impossible to run, and a solution is desired.

(Object of the Invention) The present invention has been proposed in order to effectively and effectively solve the above-mentioned problems. By installing a protection plate on the underside of the front wheel drive system, and attaching both ends of this protection plate to the front fender located above, the under guard device can be constructed. The gist is that the problem has been resolved.

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

Fig. 1 shows an embodiment in which the present invention is applied to a three-wheeled motor vehicle for traveling on rough terrain (so-called three-wheeled buggy vehicle); 2 is a plan view of the same, and FIGS. 3 and 4 are side views showing other embodiments of the present invention.

As shown in Figs. 1 and 2, 2 in the figure indicates a vehicle body frame, and a front fork 4 is pivotally attached to the front fork 4 by a helad tube 3 in front of the frame, and a bottom case 5 has a pair of bottom cases 5 at the bottom. Both ends of a stabilizer 8 on which a front wheel drive device 7 is disposed are connected to the mounting seat 6 on the upper side of the structure.

In the front wheel drive device 7 described above, a vertical drive shaft 9 disposed along the front-rear direction of the vehicle body 2 and a lateral drive shaft 10 in the vehicle interior direction are rotatably connected by meshing with a pair of bevel gears G, G2. A drive sprocket 1 is installed on the outside of the lateral drive shaft 10.
1 is spline-fitted, and an endless chino 13 is suspended between this and a driven sprocket 12 attached to the front wheel Wf side.

The vertical drive shaft 9 and the horizontal drive shaft 10 each have a bearing 1.
4.15 and housed in the gear box 16, and the rear of the vertical drive shaft 9 is a constant velocity ball joint 1.
A drive shaft 18 is connected via 7.

The front fender 30 is molded of, for example, resin, and has a width necessary and sufficient to cover the upper surfaces of the so-called front wheel drive system, such as the stabilizer 8, the front wheel drive device 7, the constant velocity ball joint 17, and the drive shaft 18. It is disposed so as to cover the vehicle body 2 in the longitudinal direction. Further, below the head tube 3, the drive shaft 18 passes vertically through an arc-shaped window 22 opened toward the rear of the protruding portion 23, and the drive shaft 18 is connected to the vehicle body 2.
It is extendably and rotatably connected to a transfer device (not shown) on the side.

On the lower surface of the front wheel drive system and above the front wheel Wf, there is a protective plate 35 that matches the width of the front fender 30 and is curved downward in side view so as not to interfere with the stabilizer 21. The under guard device is configured by being screwed and connected to the underside of the front fender 30 by bolts 36 via both end portions 37 and 38. (Any other coupling means may be used.) Thus, the lower surface of the front wheel drive system is covered with the protective plate 35 having the necessary and sufficient width and length, and the protective plate 35 cooperates with the front fender 30 on the upper surface. It is housed in a nearly sealed chamber due to the action.

FIG. 3 shows another embodiment based on the gist of the present invention, in which the protective plate 35' is integrally molded with the front fender 30' (
(marked with ○) Only the negative side is screwed together.

Furthermore, FIG. 4 shows two separate protection plates 35'' which are attached to the front and rear surfaces of the stabilizer 8 when viewed from the side, and the other side is connected to the lower surface of the front fender 30 to form an under guard.

In this way, the same function as described above can be obtained with this embodiment, whereby obstacles from the road surface or below are blocked by hitting the under guard device, that is, the protection plate 35, and damage to the front wheel drive system can be prevented. Furthermore, the lower surface of the protection plate 35 is flat, which means that when driving on muddy ground, snow, marshes, etc., there is less mud, snow, etc. adhering to the vehicle, which makes steering operations difficult. This will not cause any inconvenience.

(Effects of the Invention) As is clear from the above, according to the present invention, the lower surface of the front wheel drive system on the front fork is covered with a protective plate having the necessary and sufficient width and length, so that obstacles, etc. This eliminates the problem of direct contact with the front wheel drive system, guarantees its long-term operation, and eliminates any troubles, which is effective in improving driving safety.

Moreover, since it has a simple structure and is lightweight, it is suitable for mounting on the steering device side, and has many advantages such as being useful for improving the rigidity of the front fender.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention. Fig. 1 shows an embodiment in which the present invention is applied to a three-wheeled motor vehicle for traveling on rough terrain, and shows the front wheel, front fender, front wheel drive system, entire front fork, and a partial cross section. 2 is a plan view of the same essential parts, FIGS. 3 and 4 are side views showing other embodiments of the present invention, and FIG. 5 is a side view of the vicinity of a conventional type front fork. . In the figure, 3 is a helad tube, 5 is a bottom case, 7 is a front wheel drive device, 8 is a stabilizer, 16 is a gear box, 17 is a constant velocity ball joint, and 30 is a front fender.

Claims (1)

[Scope of Claims] 1) A front wheel drive vehicle comprising a front wheel attached to a front fork and a front wheel drive system serving as a power transmission member to the front wheel, which is installed across the front fork and covered directly above by a front fender. An underguard device for a front wheel drive system, characterized in that the lower surface of the front wheel drive system is covered with a protection plate having a length and width commensurate with the lower surface of the front wheel drive system. 2) The under guard device for a front wheel drive system according to claim 1, wherein there are two protection plates, one in the front and one in the rear around the stabilizer. 3) The under guard device for a front wheel drive system according to claim 1, wherein the front or rear portion of the protection plate is integrally constructed with the front fender.