JPH04183691A - Running vehicle driven by gas fuel - Google Patents

Abstract

PURPOSE:To shorten gas supply piping to an engine and to reduce gas supply loss to the engine by arranging an engine unit and a gas fuel supply device at a rear of a car body in a centralizing manner and capable of free swinging against the car body on the passenger side. CONSTITUTION:When applied to a motor-bicycle, a seat 9 is provided at a car body frame including a head pipe rotatably supporting a handle stem and supports an engine unit 28. A rear frame 23a formed in the shape of a square without a side when seen from above is arranged through a front frame 5 of the car body frame 1 and a swing joint 20, a gas fuel supply device 27 is integrally supported by this rear frame 23a, an engine unit supporting arm having a front end supported by the lower part of the rear frame 23a and a wheel supporting part at a rear end is arranged, and the engine unit 28 and so on is made capable of fluctuation in the front and rear direction and the right and left direction against the car body 1 on the passenger side. Also, a load carrying platform 30 is fixed to an upper part of the rear frame 23a.

Description

[Detailed description of the invention] [Industrial application field]

TECHNICAL FIELD The present invention relates to small-sized vehicles such as motorcycles, tricycles, or miniature cars that are driven by gas fuel.

[Conventional technology]

Generally, some commercial vehicles use an engine that burns gas fuel such as LPG as a driving source (Utility Model No. 59-
(See Publication No. 62257). Engines that use gas as fuel have the advantage that they can reduce emissions of CO, gas, CO gas, etc. contained in exhaust gas, compared to normal gasoline engines.

[Problem to be solved by the invention]

When installing an engine that uses the above gases as fuel in a small, lightweight vehicle such as a motorcycle or tricycle, space for equipment is limited, so when installing the gas fuel cylinder and gas fuel supply device, other vehicle body equipment parts are required. It is necessary to consider the placement balance with other factors. Furthermore, it is advantageous to make the piping from the gas fuel cylinder to the engine as short as possible in order to reduce gas supply loss during starting and restarting. The present invention has been made in view of the above circumstances, and an object of the present invention is to shorten the gas fuel piping of the gas fuel supply device, and to provide a gas fuel supply device that is driven by waste fuel and has excellent maintainability. The objective is to provide a running vehicle that

[Means to solve the problem]

In order to achieve such an object, the invention as claimed in claim 1 includes a gas fuel supply device and an engine unit having driving wheels that are centrally arranged at the rear of the vehicle body, and are swingably suspended relative to the vehicle body on the passenger side. It is characterized by what it did. Further, the invention according to claim 2 is characterized in that the gas fuel supply device storage chamber and the electrical component storage section for storing batteries, etc. are individually arranged, and a partition wall is interposed between the openings. There is.

[Effect]

In the invention as claimed in claim 1, since the engine unit and the gas fuel supply device are concentrated at the rear of the vehicle body and are swingable relative to the vehicle body on the passenger side, the gas supply piping to the engine can be shortened, and moreover, it is possible to connect them. By making the piping non-pull, it is possible to reduce the loss of gas supply to the engine. According to the second aspect of the present invention, maintenance and inspection of the gas fuel supply device can be carried out independently of the electrical component storage section that stores batteries and the like.

【Example】

EMBODIMENT OF THE INVENTION Hereinafter, an embodiment in which the present invention is applied to a tricycle will be described with reference to the drawings. Figure 1 is a side view of a motorized tricycle with one front wheel and two rear wheels;
The figure is a rear view of the same, and FIG. 3 is an exploded perspective view of the main parts. Third
In the figure, reference numeral 1 denotes a vehicle body frame, and this vehicle body frame 1 includes a head pipe 3 that rotatably supports a handle stem 2, a town tube 4 extending diagonally rearward from the head pipe 3, and a down tube 4. It is comprised of a pair of left and right front frames 5, which are divided into left and right parts from the lower end of the frame, extend horizontally, and then rise diagonally rearward. and. The vehicle body frame 1 is covered with a front cover 6, a floor cover 7, and a rear cover 8, so that only a part of the body frame 1 is visible from the outside. In addition, 9 in Fig. 1 is a /-t, and the upper part of this is extended diagonally rearward from the front cover, and the upper part of this is extended diagonally to the rear from the front cover, and is lowered to the rear of the driver. The cabin connected to Cover 8] is covered by O to protect it from the rain and wind. Note that the front of the cabin 10 is constituted by a screen lOa made of a transparent material. Further, a front wheel 12 is supported at the lower end of the handle stem 3 inserted and supported in the head pipe 3 via a stem bottom and a front fork 11, and the front wheel 12 is supported by a handle 13 attached to the upper end of the handle stem 2. Be steered. Note that 14 is a meter cover, 15 is a rearview mirror, and I6 is a headlight. Further, as shown in FIG. 4, the front end of the swing joint 20 is rotatably supported by the front frames 5, 5 of the vehicle body frame 1 along a vertical plane extending in the front-rear direction. The swing joint 20 includes a female swing joint body 21 whose front part is divided into left and right halves, and a male swing joint 22 which is rotatably inserted into a hole at the rear end of the swing joint body 21 from behind. It is composed of. A rear frame 23a formed in a U-shape when viewed from above is connected to the rear end of the male swing joint 22. An engine unit support arm 23b whose front end is pivotally supported by the rear frame 23a and has a wheel support portion at its rear end is disposed below the rear frame 23a. In addition, the rear frame 23a and the engine unit support arm 2
3b is swingable via a cushion 23c. The lower end of the rear suspension pen/tongue 25 is rotatably supported by a bracket 21a formed on the upper part of the female swing joint main body 21, and the upper end of the rear suspension 25 is extended to the left and right front frames 5.5. The cross member 26 is rotatably supported at the lower center end of the cross member 26. As a result, the gas fuel supply device 27, which will be described later, is integrally supported by the rear frame 23a, and the engine unit,
28 is the engine support unit support arm 2 below.
3b, and are suspended from the passenger-side vehicle body 1 so as to be swingable in the longitudinal and lateral directions. A loading platform 30 is fixed to the upper part of the rear frame 2.3a, as shown in FIGS. 1 and 3, and a box 32 is bolted onto the loading platform 30 via a vibration-proofing rubber 31. The inside of the box 32 is divided into upper and lower halves by a partition plate 33. The upper storage space 32a is equipped with an MB2 with a damper that can be opened and closed at the top and is used as a storage space for small items, and the lower storage space 32b is used as a part that stores the gas fuel supply device 27. Here, the partition plate 33 is arranged so as to be inclined so that it becomes gradually higher toward the rear. Also, box 3
A plurality of horizontally long slits 35 are provided at the lower part of the rear end of the storage device 2, so that the lower storage space 32b is ventilated. Furthermore, as shown in FIG.
The rear end of the box 32 protrudes rearward from the rear surface of the box 32, so that when the vehicle is moving backwards, the rear end of the loading platform 30 comes into contact with an external obstacle before the box 32. To explain the gas fuel supply device 27, as shown in FIG. 5, in the storage space 32b on the lower side of the box, a fixing plate 36 whose lower part is fixed with rubber is attached to the bottom plate of the box 32. . A gas fuel cylinder 37.3 for storing gas fuel such as liquefied natural gas or liquefied petroleum gas is provided in the arcuate recess 36a formed in the fixed plate 36.
7 are placed horizontally along the longitudinal direction of the vehicle body with an appropriate interval between them, and are fixed by bolts 38a with bands 38 across. Those cylinders 37
．． An overflow prevention valve 41.41 is interposed in the pipes 40.40 connected to the discharge ports 37, and the pipes 40 are then merged into one pipe. A three-way solenoid valve 43, a secondary pressure regulator 44, a secondary pressure regulator 45, and a solenoid valve 46 are installed in this piping 42 in order along the downstream side (engine side). The tip thereof is connected to a mixer 47. The three-way solenoid valve 43 is linked to the main switch (path shown), and only when the main switch is placed in the refueling position can fuel be refilled from the replenishment pipe 49 in which the check valve 48 is interposed. It is configured to be. The secondary pressure regulator 44 lowers the primary side gas pressure of about 150 kg/CIR' to a pressure of about 2 kg/am', and the secondary pressure regulator 4
5, the pressure is further lowered to a predetermined pressure. Further, a branch pipe 45a is branched from the secondary pressure regulator 45, and the tip of the branch pipe 45a is connected to an intake pipe 51 connected to the engine 50.
2 only when the negative pressure of the suction pipe 51 is detected.
The cock of the next pressure regulator 45 is opened to enable fuel supply from the regulator 45 to the downstream side. Further, the electromagnetic valve 46 is linked to the main switch, and only when the main switch is turned on, fuel can be supplied to the downstream side thereafter. The three-way solenoid valve 43, the primary pressure regulator 44, the secondary pressure regulator 45, and the solenoid valve 46 are fixed on the bottom plate of the box 32 between both cylinders 36, as shown in FIG. It is fixed on the mounting base 52. The cylinder 37 is refilled with gas fuel through the filling port 49a provided at the tip of the replenishment pipe 49 by opening the front cover 32C of the box 32, as shown in FIG. Further, 54 is a knob with a key. Reference numeral 55 in FIGS. 1, 3, and 4 is a battery placed on a mounting base 56 extending between the front frames 5, 5. That is, the battery 55 is placed in front of the gas fuel supply device 27, and the batteries 55
5 and the gas fuel supply device 27 are interposed between the rear cover 9 and the front lid portion 32c of the box.
It is separated by two partition walls consisting of. An engine unit 28 is supported above the engine unit support arm 23b. As shown in FIGS. 1 and 6, the engine unit 28 is composed of an engine 50, a power transmission device 61, and a rear wheel 62, which are integrally constructed. As shown in FIG. 6, the engine 50 is connected to an intake system 68 that includes a chamber box 65, an air cleaner duct 66, an air cleaner 67 having a built-in air cleaner element 67a, and the mixer 47. The mixer 47 is equipped with a pie starter 47a, and when the throttle cable 70 connected to the throttle grip is pulled or returned, the throttle valve 71 is moved up and down, and the cross-sectional area of the air suction passage 72 of the mixer is accordingly increased. At the same time that the width of the gas supply device 27 is adjusted, the needle 73 is moved up and down, and the amount of gas supplied from the gas supply device 27 is adjusted. Note that 74 is a main adjustment screw for adjusting the amount of gas to be supplied. According to the tricycle equipped with the esogen unit 28 that is driven by gas fuel having the above configuration, when the driver turns the steering wheel to the right or left while driving and simultaneously shifts his or her weight to the left or right, the vehicle body Although the front part is tilted in that direction, the rear part of the vehicle body, which is connected to the front part of the vehicle body by the swing joint 20, is maintained vertically without tilting. Additionally, when the vehicle body shakes vertically due to road surface conditions, etc., the rear part of the vehicle body swings vertically together with the rear wheels, etc., but the front part of the vehicle body where the driver rides has a rear suspension suspension 25 interposed against the rear part of the vehicle body. Since it is supported by the base, it does not move up and down that much. In this way, the gas fuel supply device 2 located at the rear of the vehicle body
7 to the rear frame 23a, and the engine unit 28
The piping 42 connecting the gas fuel supply device 27 and the engine unit 28 , 45a can be shortened, and there is no need to insert parts such as flexible pull joints into the piping connecting them. In addition, the gas fuel supply device 27 and the battery 55 are arranged apart from each other in the front and rear of the vehicle body, and partition walls such as the rear cover 9 and the front lower part 32d of the box are interposed between them, so that the gas fuel supply device 27, it can be maintained independently regardless of the battery 55, and conversely, when maintaining and inspecting the battery 55, it can be maintained independently regardless of the gas fuel supply device 27. etc. can be done. In addition, a ventilation opening is formed in the lower chamber of the box that houses the gas fuel supply device, so even when the temperature of the lower chamber of the box tends to rise in summer, the same room can be ventilated to suppress the temperature rise. . Figure 9 shows CO, gas, carbonized gas, and CO gas contained in exhaust gas when gasoline is used as the engine fuel and when liquefied natural gas is used as the engine fuel. This shows a comparison of the contents of As is clear from these figures, by switching the fuel to gaseous fuel such as LPG, it was possible to reduce unnecessary gases such as CO and gas contained in the exhaust gas. In the above embodiments, an example in which the present invention is applied to a three-wheeled motor vehicle has been described, but the present invention is not limited thereto, and of course can also be applied to a two-wheeled motor vehicle. In that case, the joint that connects the front part of the vehicle body and the rear part of the vehicle body may simply have a structure that is swingable in the front and rear directions relative to the front part of the vehicle body, and a structure that supports the joint so that it can swing freely in the horizontal direction is not required. Further, in the above embodiment, a partition wall is used to partition the gas fuel supply device 27 and the battery 55, but the partition wall is not limited to this, and only one of them may be used, or other members may be used. good. Further, in the above embodiment, the gas fuel supply device is placed at the rear of the vehicle body relative to the battery 55, but the invention is not limited to this. Conversely, the gas fuel supply device is placed at the front of the vehicle body, and the battery is placed at the rear of the vehicle body. They may be arranged, or they may be arranged separately on the left and right sides of the vehicle body.

【Effect of the invention】

As explained above, in the invention described in claim 1, claim 1
In the described invention, the engine unit and the gas fuel supply device are concentrated at the rear of the vehicle body and are swingable relative to the vehicle body on the passenger side, so that the gas supply piping to the engine can be shortened.
Furthermore, the piping that connects them can be simplified, reducing gas supply loss to the engine. According to the second aspect of the invention, maintenance and inspection of the gas fuel supply device can be carried out independently of the gas fuel supply device itself, regardless of the electrical component storage section that stores the battery and the like.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and Fig. 1 is a side view of the tricycle, Fig. 2 is a rear view of the tricycle, Fig. 3 is an exploded perspective view of the main parts, and Fig. 4 is a rear perspective view of the vehicle body frame. Figure, Figure 5 (a)
, (B) is a plan view and side view of the lower part of the box that houses the gas fuel supply device, Figure 6 is a perspective view of the engine unit and its surroundings, Figure 7 is a sectional view of the mixer, and Figure 8 is the gas fuel supply. System diagram of the device, Figure 9 (a), (b),
(c) is a diagram showing a comparison between the predetermined amount of gas contained in the exhaust gas of the three-wheeled motor vehicle and the predetermined amount of gas contained in the exhaust gas of a conventional gasoline vehicle. 1... Body frame 5... - Front frame 8... Rear cover (compartment wall) 20... Swing joint 23a... Rear frame 27... Gas Fuel supply device 28...Engine unit 32...Box 32C...Lid (compartment wall) 35...Slit 37...Gas fuel Cylinder 55...Battery 50...Engine 62...Rear wheel (drive wheel)

Claims (2)

[Claims] (1) Traveling driven by gas fuel, characterized in that a gas fuel supply device and an engine unit having drive wheels are centrally arranged at the rear of the vehicle body, and are swingably suspended from the vehicle body on the passenger side. vehicle. (2) Traveling powered by gas fuel, characterized in that a gas fuel supply device storage chamber and an electrical equipment storage section for storing batteries, etc. are individually arranged, and a partition wall is interposed between them. vehicle.