JPS61229613A - Vehicle for running of off-road ground - Google Patents

Abstract

PURPOSE:To eliminate a long length draft tube, by supporting a liquid-tight gear box incorporating a final speed reduction gear, to a vehicle body frame with the use of pipe frame members, and by communicating the gear box with the pipe frame members which incorporates a propeller shaft, gas- and fluid-tightly. CONSTITUTION:In a tri-cycle buggy the output power of an engine is transmitted through a propeller shaft 50 which extends through a propeller shaft cylinder 34 constituting a part of pipe frame members in a rear fork assembly 30, to a final drive gear 52 which is disposed in a gear box 40 integrally incorporated with an axle cylinder 38, at the terminal end of the propeller shaft 50, and from which the output power is transmitted to a final driven gear 54 above a rear axle shaft 60 that extends through the axle cylinder 38. In this arrangement a pipe joint 44 is fitted in a draft hole which is formed in the upper wall of the liquid-tight gear box 40 on the side communicated with the propeller shaft cylinder 34 and which is in the vicinity of an oil seal 46. Further, a pipe joint 35 is also fitted in a draft hole formed in the upper wall of the propeller shaft cylinder 34. The above-mentioned pipe joints 35, 44 are connected together by means of a gear box ventilating draft pipe 48 made of rubber, thereby it is possible to ventilate the gear box 40.

Description

[Detailed Description of the Invention] The present invention relates to a shaft drive type rough terrain vehicle that transmits engine output to rear wheels via a propulsion shaft.
In particular, it relates to a ventilation structure for a gear box that houses a final reduction gear.

[Final reduction gear in shaft drive vehicles 1.
- The gear box in which the lubricant is stored is loaded with lubricating oil. While the vehicle is running, when the temperature of the final reduction gear and the lubricating oil rises F'l"J, the L in the gear box
1- is placed on top, which puts a strain on the oil seal, so it is common to form a ventilation hole (commonly known as a breather hole) in the gear box.

However, in rough terrain vehicles such as shaft drive three-wheel buggies equipped with low-pressure tires, when driving underwater,
Since the gear box housing the final reduction gear may be submerged in water, it is necessary to connect a ventilation pipe to the ventilation hole and open the other end at the top of the vehicle body (for example, in Japanese Patent Laid-Open No. 59-13
(See Publication No. 7217).

In such a structure, the ventilation pipe is long and must be connected to the rear wheel suspension R structure, making it difficult to arrange the ventilation. It is fine and the silk attachment is complicated.

An object of the present invention is to provide a final reduction gear storage gear A that does not require a long ventilation pipe.
The main feature is that it provides a seven-box ventilation structure.

The purpose of this was to use the J3, a shaft drive type rough terrain vehicle that transmits the output of the engine located between the front and rear wheels to the rear wheels via the thrust J/V axle. - The gear box containing the final reduction gear that interlocks the axle and the rear axle is made into a liquid carrier, and the gear box is attached to the vehicle body frame using a pipe frame member.
(hereinafter referred to as the vehicle body frame), and a gear box,
Adjacent to this is a pipe frame portion 4 that houses the propulsion shaft in an air-watertight manner.
This is achieved by communicating with

An embodiment of the present invention shown in FIGS. 1 to 5 will now be described.

Figure 1 shows 10 automatic tricycles (three-wheel buggy vehicles) for traveling on rough terrain.
The tricycle 10 is shown traveling underwater with an OM riding on it, and the tricycle 10 is equipped with a front axle FW equipped with low-pressure tires and a pair of left and right rear wheels. The body frame of the tricycle 10 includes a head pipe 12 and a main frame 1 that extends rearward from the head pipe 12.
4, a pair of left and right gounch coves 1G that are connected to the head pipe 12 and extend toward the rear of the vehicle body through the front and below of the engine E located between the front and rear wheels; -*;″]: A pair of left and right central frames 18 connected to the Guntube 16,
The left side extends to the main frame 14 at 3ta and extends toward the rear of the vehicle.
A pair of right seat support frames 20 and a pair of left and right rear frames 22 whose front ends are connected to i>D2 of the downcove 16 and the lower end of the central frame 18, and whose rear ends are connected to the seat support frame l\20. It is formed as a main member. Then, the fuel tank T is placed on the main frame 14, the seat S is placed on the seat support frame 20,
A vehicle body cover 24 integral with the rear fender is attached to cover the outside of the vehicle body below the seat S, the right side surface, and the upper part of the rear vehicle body (see FIGS. 2 to 4).

Further, the output of the engine is transmitted through the propulsion shaft 50 passing through the propulsion shaft tube 34 of the rear fork assembly 30, and then within the gear box 40, which is also formed integrally with the axle tube 38 of the rear fork assembly 30. , is transmitted from the final drive gear (pinion gear) 52 connected to the end of the propulsion shaft 50 to the final driven gear (ring gear) 54 on the rear axle 60 passing through the axle tube 38, thereby causing the rear axle 60 to rotate. Therefore, rear fork assembly 3
0 is at point P in Figure 2, and is connected to pivot 1/bolt P.
It is tiltably supported by the vehicle body frame FB via R, and is formed into a substantially trapezoidal rigid structure as a whole, with a support shaft cylinder 32 as a horizontal member, a propulsion shaft cylinder 34 as a vertical member, The freezing tube 3G and the gear box 4 welded to the rear end of the propulsion shaft cylinder 34
0, the axle cylinder 38 welded to the gear box 40 and the connecting pipe 36, and a reinforcing pipe 39 for reinforcing them as a main frame (pipe frame member), and is attached to the vehicle body frame via the rear cushion 70. It is connected to the top of FB. Also,
The tip of the propulsion shaft cylinder 34 is air-water-tightly connected to a joint box body 26, which is air-water-tightly attached to the transmission case of the engine E, via a bellows-shaped rubber pipe joint 28.

In a portion where the propulsion shaft cylinder 34 is connected to the gear box 40, it is close to one of the three oil seals 46 that seal the gear box 40, and a ventilation hole 42 leading to the gear box interior is located in the earthen wall of the gear box 40. A rubber gear box ventilation pipe 4 is formed in the pipe joint 44 that is partially protruding from the ventilation hole 42 = 4.
One end of the gear cylinder ventilation pipe 48 is fitted in an air and watertight manner, and the other end of the gear cylinder ventilation pipe 48 is fitted in an air and watertight manner to a pipe joint 35 that is provided with a vent hole in the upper wall of the propulsion qi+ cylinder 34. (Figure 2,
See Figure 5. However, the pipe joints 35 and 44 in FIG. 5 do not show their actual positions, but are shown in a developed view at lateral positions rotated about the propulsion shaft 50. Also,
In the figure, 80 indicates a trailer traction member).

The present embodiment is constructed as described above, and the inner chamber of the gear box 40 and the inner chamber of the sealed LLI advance shaft cylinder 34 are communicated via the gear cylinder ventilation pipe 48, and are supported. The internal volume of the AT advance shaft cylinder 34, which also communicates with the inner chamber of the shaft cylinder 32, is sufficiently large, and furthermore, the propulsion shaft cylinder 34, the support shaft cylinder 32, and the reinforcing pipe 39 connected to these can function even if they are used as heat radiators. Since it is always kept at a low temperature (equivalent to the atmospheric temperature), the gear box 4 is
Even if the internal gas expands due to the 1 degree upper limit of 'lj within 0, the expansion will flow into the propulsion shaft cylinder 34, suppressing the internal leakage of the gear box 40. Therefore, a phenomenon in which undesirable pressure is applied to each oil seal 46 can be effectively prevented.

Furthermore, as a matter of course, even if the vehicle travels with the engine E and the rear fork assembly 30 submerged in water, water, mud, etc. will not enter the sealed space of the gear box 40 and the propulsion shaft cylinder 34.

Further, since the gear marine ventilation pipe 48 is sufficiently short, piping can be easily performed, and the efficiency of the assembly operation is improved.

Next, another embodiment that does not use the gear marine ventilation pipe 48 will be described (see FIGS. 6 and 7).

The rear end of the propulsion shaft 50 is formed into a large cylindrical body 51e, into which the shaft portion 56 of the final driven gear 754 is fitted in a spline-engaged state. A centrifugal bubble separator 90 is fitted into the base of the cylindrical body 51, and an opening 94 formed on its outer periphery that communicates with the cylindrical member 92 is formed along the axis of the IF +l 150. It faces the open end of the hole 50A (having the branch hole 50B).

In this way, in this embodiment, the inner chambers of the gear V box 40 and the propulsion shaft cylinder 34 are connected to the spline joint of the cylinder body 51 and the shaft part 56, the groove 92 of the centrifugal bubble separator 90, the opening 94, and Shaft hole 50A
, 503, it is possible to prevent the internal pressure of the gear box 40 from rising A in the same manner as in the previous embodiment, and the external force is not affected by the pair of communication parts, making the external shape simple.

<iOh, while the vehicle is running, the amount of lubricating oil that enters the cylindrical body 51 is equal to the amount of centrifugal air bubbles + 11! Due to the centrifugal action caused by the rotation of n90, the frontage 94 is not reached and the propulsion shaft cylinder 34
This prevents lubricating oil from entering inside.

Further, in each of the embodiments described above, the rear wheel RW is tiltably supported by the vehicle body frame or disposed on the hook assembly 30. The present invention can also be applied to a drive-type rough terrain vehicle, that is, a vehicle in which the rear wheels are directly supported by the vehicle body frame.

As is clear from the above explanation, the present invention provides Aδ in the vehicle body frame.
A pipe frame member for supporting a gear box, the gear box;
The gear box is a pipe frame member that supports the gear box, and the pipe frame member that houses the propulsion shaft adjacent to the gear box in an air-water-tight manner is communicated with each other, so that the temperature inside the gear box increases during driving. Even if you turn your back on it, expanding gas flows into the low-temperature, large-volume pipe frame, effectively preventing the internal pressure from rising, and without the hassle of running a long gear marine ventilation pipe all the way to the top of the car body. This simplifies the vehicle body structure and improves vehicle assembly work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a state in which a motorcycle according to an embodiment of the present invention runs underwater, FIG. 2 is a left front view of the motorcycle with the left rear wheel removed, and FIG. 3 is a plan view of the motorcycle. 4 is a rear view, FIG. 5 is a cutaway bottom view of the main parts showing the rear wheel drive mechanism, FIG. 6 is a cutaway plan view of the main parts showing the rear wheel drive mechanism according to another embodiment, and FIG. The figure is a perspective view of a centrifugal bubble separator used in the mechanism. 10...Auto tricycle, 12...Head pipe, 14
... Main frame, 16... Downch Cove, 18.
...Central frame, 20...Seat support frame, 22
...Rear frame, 24...Vehicle cover, 30...
・Rear fork assembly, 32... Propulsion -Q -++ = 8 - Axle tube, 34... Axle tube, 36... Connecting pipe, 38...
・Axle cylinder, 39... Reinforcement pipe, 40... E1F box,
42...Vent hole, 44...Pipe joint, 4G...Oil seal, 48...Gear marine ventilation pipe, 50...Propulsion shaft, 51...Cylinder body, 52...Final drive Gear A7.54
...Final driven gear, 56...Shaft portion, 60...Rear axle, 70...Rear cushion, 80...Trailer
Traction member for use, 90...Centrifugal bubble force N1 shell, 92...
・f%s, 94...Aperture.

Claims (1)

[Scope of Claims] A shaft drive type rough terrain vehicle that transmits the output of an engine located between the front and rear wheels to the rear wheels via a propulsion shaft, comprising: a final deceleration that links the propulsion shaft and the rear axle; A pipe member that forms a gear box in which a gear is stored in a liquid-tight manner, supports the gear box on a vehicle body frame by a pipe frame member, and stores the gear box and a propulsion shaft adjacent thereto in an air-water-tight manner. A vehicle for running on rough terrain characterized by communicating with.