JPH0523393Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a vehicle engine for running on rough terrain that is provided with a power take-off shaft in addition to the wheel drive shaft.

Prior Art There are 4-wheel or 3-wheel straddle-type vehicles (buggy vehicles) equipped with low-pressure, wide tires (balloon tires) as vehicles for traveling on rough terrain. For example, Japanese Utility Model Application Publication No. 16178/1984 describes a vehicle that can be attached with a working auxiliary machine and used as a working vehicle for agricultural purposes. In this vehicle, the power take-off shaft extends from the drive section of the rear wheels and is linked to the drive of the rear wheels, so its rotation is affected by the vehicle speed.

On the other hand, Japanese Patent Application Laid-Open No. 61-6023 discloses that the power of a power output shaft is extracted from the upstream side of a transmission built in the engine via a gear transmission mechanism, and the gear transmission mechanism is connected to one side of the engine. An all-terrain vehicle is described in which a rear wheel drive gear transmission mechanism provided at the countershaft end of the transmission is disposed on the other side of the engine. In this vehicle, the rotation of the power take-off shaft is not affected by the vehicle speed, but a new gear transmission mechanism must be installed to transmit power to the power take-off shaft, which makes the engine mechanism complex and parts This results in an increase in the number of points and weight.

Means and Effects for Solving the Problems The present invention relates to an improvement of the engine for an all-terrain vehicle that eliminates the above-mentioned problems, and the engine and the transmission are integrally formed, and the transmission In an engine for an all-terrain vehicle equipped with an output system for driving a vehicle and an output system for driving an auxiliary machine for work, an engine starting train having a first clutch is provided in the transmission, and in the engine starting train, The present invention is characterized in that the output system for driving the working auxiliary equipment is connected to the engine side from the first clutch via the second clutch.

Since the present invention is constructed as described above,
When the engine starting system is operated when the engine is stopped, rotational force is transmitted to the engine via the first clutch, and the engine is brought into a starting state.

Furthermore, when the second clutch is set to an engaged state while the engine is operating, the power of the engine is transmitted to the work accessory drive output system via the second clutch, regardless of whether the first clutch is disengaged, thereby enabling the work accessory to be driven.

In this way, the present invention utilizes the engine starting train, which is in a idling state while the engine is rotating, to
Since engine power can be transmitted to the output system for driving auxiliary equipment for work, there is no need to provide a special gear transmission mechanism, which simplifies the engine structure, reduces the number of parts, and reduces weight. At the same time, since the engine power is transmitted to the working auxiliary equipment driving output system without going through the vehicle driving output system, the rotation of the working auxiliary equipment output shaft is not affected by the vehicle speed.

Embodiments The present invention will be explained below with reference to illustrated embodiments. FIG. 1 is an overall perspective view of an all-terrain vehicle 2 equipped with an engine 1 according to the present invention. This rough terrain vehicle 2 has a pair of front wheels 3, 3 and a pair of rear wheels 4, 4.
These wheels 3 and 4 have low pressure and low pressure, respectively.
It is equipped with wide balloon tires. The engine 1 is mounted in the center of a vehicle body frame 5, and the upper part of the vehicle body is covered with a vehicle body cover 6. A seat 7 is provided on the upper part of the vehicle body cover 6, and the driver straddles this seat 7 and places his/her feet on the vehicle body frame 5.
Step 8 protrudes from the left and right at the bottom of the
Place it on top of the vehicle and operate the handle 9 by hand to drive. 10 is a hard arm, this hard arm 1
By kicking 0 with the foot, starting power is transmitted to the crankshaft of the engine 1 through a kick starting system, which will be described later, and the engine is started. This engine drives the rear wheels 4 or both the rear wheels 4 and the front wheels 3, and the engine 1 is further provided with a power take-off shaft 11, which extends rearward from the engine 1. A working auxiliary machine can be attached to the power take-off shaft 11 as described above, and in this way the vehicle 2 can also be used as a working vehicle.

FIG. 2 is a partial sectional view of the engine 1. 1
Reference numeral 2 denotes a crankshaft, which is rotatably supported by a crankcase 13, with a generator 14 attached to its left end, and a drive gear 15 attached to its right end. A main shaft 16 is arranged parallel to the crankshaft 12,
A driven gear 17 loosely fitted onto the main shaft 16 meshes with the drive gear 15. The driven gear 17 is connected to the input side of a clutch 18 , and the output side of the clutch 18 is connected to the main shaft 16 . When the clutch 18 is brought into the connected state by the clutch actuating member 19 , the rotation of the crankshaft 12 is transferred to the drive gear 15 . , is transmitted to the main shaft 16 via the driven gear 17 and the clutch 18. The rotation of the main shaft 16 is controlled by a speed change gear device 20.
By selectively engaging the gears, the transmission is transmitted to the countershaft 21, which is the wheel drive shaft, at a required speed ratio. One end of the counter shaft 21 is connected to the crank case 1
A drive chain 23 protrudes laterally through 3 and meshes with a sprocket 22 mounted on the end thereof.
The rear wheels 4 are driven via the. Counter axis 2
1 can be transmitted not only to the rear wheels 4 but also to the front wheels 3.

The crank arm 10 is attached to the crank case 13.
A base portion is fixed to an end portion of a crank spindle 24 which is rotatably supported by the crank case 13 and projects laterally from the crank case 13. Kick spindle 2
A kick starter gear 25 is rotatably loosely fitted into the starter gear 25, and an intermediate gear 27 is loosely fitted to the intermediate shaft 26, an intermediate gear 29 is loosely fitted to the intermediate shaft 28, and the main shaft is connected to the starter gear 25. The starter pinion 30, which is loosely fitted into the shaft 16, is sequentially meshed with the shaft starter pinion 30. The starter pinion 30 is fitted into the driven gear 17 so as to rotate integrally therewith. Further, a clutch member 3 is attached to the kick spindle 24, which rotates together with the screw spindle 24, and slides toward the kick starter gear 25 to engage with the kick starter gear 25 in accordance with the rotation of the kick spindle 24.
1 is provided. Therefore, when the kick spindle 24 is rotated by kicking in the clutch member 31, the rotational force of the kick spindle 24 is transmitted to the kick starter gear 25 via the clutch member 31, and further to the intermediate gear 27, the intermediate gear 29,
It is transmitted to the crankshaft 12 via the starter pinion 30, the driven gear 17, and the drive gear 15, and the rotation of the crankshaft 12 compresses and ignites the air-fuel mixture in the cylinder, starting the engine 1. When the force applied to the kick arm 10 by the driver's foot is removed, the kick spindle 24 returns to its original rotational position due to the spring force, and at the same time the clutch member 31 engages the kick starter gear 25.
The kick starter gear 25 is then retracted and is again loosely fitted to the kick spindle 24, and the starting system from the kick starter gear 25 to the kick starter pinion 30 continues to idle while the engine 1 is running.

The present invention attempts to connect the power take-off shaft 11 to this idling starting system and extract the rotational power of the crankshaft 12 to the power take-off shaft 11.
Therefore, in this embodiment, as shown in FIG.
A bevel gear 35 formed integrally with the power take-off shaft member 34 is meshed with the bevel gear 32 . The power take-off shaft member 34 is disposed perpendicular to the crankshaft 12 and each of the axes in the front-rear direction, is rotatably supported by the crank case 13 via a bearing 36, and extends rearwardly through the crank case 13. It has extended to The power take-off shaft 11 is connected to this extending end via a spline 37.
(Fig. 1) are connected and extend toward the rear of the vehicle.
As is clear from FIGS. 3 and 1, the power take-off shaft 11 is located inside the kick arm 10 attached to the outer end of the kick spindle 24, and does not interfere with the kick-in of the kick arm.

A shifter 38 is spline-fitted to the intermediate shaft 26 on the side opposite to the bevel gear 32 with respect to the intermediate gear 27, and the shifter 38 slides left and right on the intermediate shaft 26 by operating a lever (not shown). It's becoming like that. A dog clutch 39 that is engaged when the shifter 38 approaches the intermediate gear 27 is provided on the opposing sides of the intermediate gear 27 and the shifter 38, and when the dog clutch 39 is engaged and disengaged, the power take-off shaft member 34 is The power transmission is now disconnected.

In this way, in this embodiment, a gear train of the kick start system is used, a bevel gear 32 is attached to the intermediate shaft 26 of the gear train, and the bevel gear 35 of the power take-off shaft member 34 is meshed with the bevel gear 32. The power take-off shaft 11 is attached to the engine 1 by an extremely simple means.
can be attached. Therefore, compared to a conventional engine with a power extraction shaft, the structure is simpler, the number of parts is reduced, and the weight is also reduced.

FIG. 4 shows another embodiment of the invention. The structure of the engine 1 is basically the same as that of the embodiment described above, and in FIG. 4, the same parts as in the embodiment described above are given the same reference numerals. In the embodiment described above, power was extracted from the intermediate shaft 26 of the starting gear train from the kick starter gear 25 to the kick starter pinion 30, but in this embodiment, a new power extraction shaft was installed adjacent to the kick spindle 24. A gear shaft 40 is provided. The gear shaft 40 is rotatably supported by the crankcase 13 via a bearing 41, and is arranged parallel to the gear spindle 24. A gear 42 is rotatably loosely fitted to the gear shaft 40, and the gear 42 is loosely fitted to the gear shaft 40,
It is constantly meshed with the upper starter gear 25. The gear 42 is a shifter 38 and a dog clutch 39 provided on the intermediate shaft 26 in the embodiment described above.
The gear shaft 40 is connected to and disconnected from the gear shaft 40 through a shifter 43 and a dog clutch 44 similar to the above. A bevel gear 45 is attached to the left end of the gear shaft 40.
The bevel gear 35 of the power take-off shaft member 34 is meshed with.

According to this embodiment, the location of the power take-off shaft member 34 can be selected with a considerable degree of freedom, so that it is difficult to secure sufficient space for arranging the power take-off shaft member 34 near the intermediate shaft 26. This is convenient in such cases. Although the gear shaft 40 must be newly provided compared to the previous embodiment, the effects of the present invention such as a simpler structure, a reduction in the number of parts, and a reduction in weight can be fully obtained compared to conventional engines.

Note that in each of the above embodiments, the power take-off shaft is connected to a kick start system that starts the engine by a kick arm, but the power take-off shaft may be connected to a starter motor start system that starts the engine using a starter motor, for example. It goes without saying that many other modifications are possible within the scope of the present invention.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view of an all-terrain vehicle equipped with an engine according to the present invention, Fig. 2 is a partial sectional view of the engine according to the invention, and Fig. 3 further shows the starting system and power extraction portion of the engine. A detailed sectional view, FIG. 4, is a sectional view similar to FIG. 3 showing another embodiment of the present invention. 1...Engine, 2...Vehicle, 3...Front wheel, 4
... Rear wheel, 5 ... Body frame, 6 ... Body cover, 7 ... Seat, 8 ... Step, 9 ... Handle, 10 ... Kick arm, 11 ... Power take-off shaft, 12 ... Crankshaft, 13... Crank case, 14... Generator, 15... Drive gear, 16...
...main shaft, 17...driven gear, 18...clutch,
19...Clutch operating member, 20...Transmission gear device, 21...Counter shaft, 22...Sprocket, 23...Drive chain, 24...Kick spindle, 25...Kick starter gear, 26, 28
...Intermediate shaft, 27, 29...Intermediate gear, 30...
Kick starter pinion, 31... Clutch member, 32, 35, 45... Bevel gear, 33... Nut, 34... Power take-off shaft member, 36... Bearing, 37... Spline, 38, 43... Shifter, 39, 44...dog clutch, 40...gear shaft, 41...bearing, 42...gear.

Claims (1)

[Scope of utility model registration request] In an engine for an all-terrain vehicle in which an engine and a transmission are integrally formed, and the transmission is equipped with an output system for driving the vehicle and an output system for driving auxiliary equipment for work, the first clutch is An engine starting system having the following is provided in the transmission, and the output system for driving the working auxiliary equipment is connected to the engine side from the first clutch in the engine starting system via a second clutch. vehicle engine.