JPH0215703Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a power extraction device for a vehicle that uses the power of the vehicle drive engine to extract power from other devices such as a generator and a winch. Power
(take off)

[Prior art]

Conventionally, in vehicles used for special purposes, the power of the engine that drives the vehicle is used to generate a generator,
It may drive devices such as winches. In this way, in conventional power extraction devices that extract power from the engine to drive other devices, the power extraction shaft,
A single device is constructed by housing and arranging the transmission mechanism, etc. of the engine in a separate housing, and this single device is attached to the side of the transmission case that houses the engine transmission mechanism, and is placed inside the transmission case. The single power take-off device is driven through a power transmission device such as a drive gear, and power is taken out from the power take-off shaft.

Therefore, the conventional power take-off device not only increases the size of the vehicle and increases the weight of the vehicle, but also causes an increase in the cost of the vehicle.

[Purpose of invention]

In view of the above-mentioned problems, the object of this invention is to provide a power extraction device for a vehicle that is compact and has a simple structure.

[Structure of the idea]

That is, in this embodiment, the output shaft and the crankshaft are housed in the same gear case, and both shafts are connected to each other via a centrifugal clutch and a manual clutch that are in contact when the rotational speed of the crankshaft exceeds a certain level. The above purpose is achieved by linking them.

〔Example〕

Embodiments will be described below with reference to embodiments shown in the drawings.

FIG. 1 and FIG. 2 show a part and external appearance of a power transmission mechanism of a straddle-type four-wheel vehicle to which a power extraction device for a vehicle according to the present invention is applied.

The front and rear wheels of this straddle-type four-wheeled vehicle 1 are equipped with balloon tires 2 and 3, respectively, which have low air pressure and are used for traveling on rough terrain. Further, direction change of the saddle type four-wheeled vehicle 1 is performed by a bar handle 4,
When the bar handle 4 is operated, a wheel steering mechanism (not shown) disposed inside the vehicle body 5 (for example, an Atsukerman mechanism) steers the front balloon tire 2 and changes direction. Further, a transverse engine 7 having a crankshaft disposed at right angles to the direction of travel (arrow A) is mounted on the body frame 6 of the vehicle body 5. Further, inside the crankcase 8 of the engine 7, a power transmission device shown in the sectional view of FIG. 1 is arranged and housed.

In this engine 7, a drive gear 11 is rotatably supported at the end of a crankshaft 10,
The drive gear 11 of the crankshaft 10
A centrifugal clutch 12 is interposed between the two. This centrifugal clutch 12, like the starting clutch,
The contact state is maintained when the rotational speed of the crankshaft 10 is equal to or higher than a predetermined rotational speed, and the power of the crankshaft 10 is transmitted to the drive gear 11 in the contact state. Further, in this engine 7, a multi-plate clutch 14 is disposed at the end of the primary shaft 13, and a primary gear 15, which is integrally attached to a clutch housing 14a of the multi-disc clutch 14, is connected to a drive shaft of the crankshaft 10. It meshes with the gear 11. Therefore, when the multi-plate clutch 14 is in the engaged state, the power of the drive gear 11 is transferred to the primary shaft 13 via the primary gear 15 and the multi-plate clutch 14.
is transmitted to. The power of the crankshaft 10 transmitted to the primary shaft 13 in this manner is appropriately decelerated there through the gear train 16 and transmitted to an axle shaft (not shown).

On the other hand, in this engine 7, a power take-off device 20 is incorporated into a crankcase (gear case) 8. In this power take-off device 20, an output shaft 21 is disposed parallel to the crankshaft 10. A driven gear 22 is supported on the output shaft 21 so as to freely rotate. A dog clutch member 23 is provided. This dog clutch member 23 is connected to the driven gear 22
It constitutes a manual clutch 25 together with a dog 22a formed in a shape, a shifter oak 24, etc. which will be described later, and is supported so as to be non-rotatable but movable in the axial direction with respect to the output shaft 21, and has a dog 23a on an end surface. Furthermore, an annular groove 23b on the circumferential surface
It is equipped with In this annular groove 23b,
The end portion of a manually operated shifter oak 24 is inserted therein. One end of the output shaft 21 projects outward from the crankcase 8, and a pulley 26, which is a rotating body for extracting power, is fixed to the end. and,
This pulley 26 is, for example, a pulley 2 of a generator 27 installed at the front of the vehicle as shown in FIG.
8 via a belt 29.

Such a power take-off device 20 operates as follows.

While the rotational speed of the crankshaft 10 is in the idling range, the centrifugal clutch 12 is maintained in the disengaged state. Therefore, the power of the crankshaft 10 is not transmitted to the drive gear 11. Driven gear 22 is not rotated.

When the rotational speed of the crankshaft 10 increases and exceeds the idling range, the centrifugal clutch 12 becomes engaged. Then, the power of the crankshaft 10 is transmitted to the drive gear 11, and the drive gear 11 is rotated. In this way, when the drive gear 11 is rotated, the driven gear 22 is also rotated accordingly. However, while the clutch member 23 is in the position shown in FIG. 1, the rotational force of the drive gear 11 is not transmitted to the output shaft 21. In this state, when the shifter oak 24 is operated to actuate the clutch member 23 and its dog 23a is engaged with the dog 22 of the driven gear 22, the output shaft 21 is integrated with the driven gear 22. Therefore, the power of the crankshaft 10 is transmitted to the output shaft 21 via the driven gear 22.
Rotate 1. This output shaft 21
The rotational force is transmitted to the pulley 28 via the pulley 26 and the belt 29, and drives the generator 27.

Furthermore, in this power take-off device 20, even if the manual clutch 25 is maintained in the engaged state, when the rotation speed of the crankshaft 10 falls to the idling range, power transmission is cut off and the drive of the generator 27 is stopped. .

In the above embodiment, the pulley 26 is used as the power extraction means, but the pulley 26 may be replaced with a sprocket, a gear, etc. Also, a winding drum of a winch, for example, may be installed at the end of the output shaft 21. It goes without saying that you may also install the following.

[Effect of idea]

As mentioned above, the vehicle power extraction device according to the present invention is compact because the entire device is housed in the crankcase (gear case), and the structure is simple because the power is obtained from the crankshaft. Furthermore, since it is stopped when the vehicle is idling, this is extremely advantageous, especially when it is necessary to extract power only while the vehicle is running.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a power transmission mechanism of a vehicle equipped with a power take-off device according to the present invention, and FIG. 2 is a perspective view of the exterior of the vehicle. 7... Engine, 8... Crank case (gear case), 10... Crankshaft, 11... Drive gear, 12... Centrifugal clutch, 20... Power take-off device, 21... Output shaft, 22... Driven gear, 22a... Dog, 23... Clutch Member, 23a... Dog, 23b... Annular groove, 24... Shifter oak, 25... Manual clutch, 26... Pulley (rotating body), 27... Generator, 28... Pulley, 2
9...Belt.

Claims (1)

[Scope of utility model registration request] A drive gear is disposed on the crankshaft so that it can rotate freely, and a centrifugal clutch is interposed between the crankshaft and the drive gear, which becomes engaged when the rotational speed of the crankshaft exceeds a certain level. An output shaft having a rotating body at its outer end is supported by a gear case in parallel with the crankshaft, and a driven gear meshing with the drive gear is disposed on the output shaft so as to freely rotate; A power extraction device for a vehicle, characterized in that a manual clutch is interposed between the drive gear and the driven gear.