JPS6138706Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a transmission device for a backpack-type or portable power sprayer.

Conventionally, this type of power sprayer, which has been required to be lightweight and compact, has mainly been a two-stroke
An engine (hereinafter referred to as a prime mover) is used as a power source, but this prime mover has the characteristic that it cannot produce effective output unless it rotates at high speed.
Reciprocating pumps have contradictory properties in that high-speed rotation shortens their durability, and at the same time, their functional performance also decreases.

Conventionally, as shown in FIGS. 1a and 1b, a reduction pulley e is attached to a driving crankshaft b connected to a piston a of the prime mover, and a driven crankshaft d connected to a plunger c of a reciprocating pump. , f, and these pulleys e, f are connected to belt g.
The rotation from the prime mover was decelerated and transmitted to the reciprocating pump. Also, instead of pulleys e and f, a pair of reduction gears or the like was used to transmit deceleration. However, all of these methods have a limit on the reduction ratio and cannot fully utilize the functions of the machine. In addition, since it is a reciprocating pump c, if the compression stroke of prime mover a and the compression stroke of pump c coincide, it may be difficult to start prime mover a, and if a clutch or the like is used, there is uncertainty in synchronizing the timing. The problem was that it was unavoidable.

This invention was made with the intention of solving the above problem, and by connecting the drive side crankshaft of the prime mover and the driven side crankshaft of the reciprocating pump via a planetary gear reduction mechanism, it reduces speed. It is possible to widen the ratio range and fully demonstrate the ability of the prime mover during high-speed rotation, and it also eliminates the difficulty of starting due to synchronization of the strokes of the reciprocating parts of the prime mover and pump, and is compact and strong. The present invention aims to provide a transmission device for a backpack-type power sprayer, etc., which has excellent performance and effects.

An embodiment of this invention will be described below based on FIGS. 2 and 3.

Figures 2a and 2b are a schematic plan view showing the structure of the transmission device of this invention and a side view of its main parts;
1 is the piston of the prime mover, and this piston 1
Piston 1 is attached to stove 2 which extends coaxially with
A drive-side crankshaft 3 is installed to convert the reciprocating displacement of the pump into rotational displacement, and 4 is a plunger of the reciprocating pump. A driven crankshaft 6 that can convert reciprocating displacement is attached. Both crankshafts 3 and 6 are arranged coaxially, and a planetary gear reduction mechanism 7
are connected to each other via. That is, a plurality of (three) planetary gears 9 that can mesh with the pinion 8 attached to the connecting portion of the drive side crankshaft 3...
By meshing with the crown internal gear 10 and connecting the centers of the planetary gears 9 and the driven crankshaft 6 via the planetary gear shaft 11, the high-speed rotation of the prime mover is decelerated and reciprocated. It is designed so that it can be transmitted to the dynamic pump side.

FIG. 3 is a sectional view showing an example of the use of the transmission device of this invention, in which case it is used in a two-stage reciprocating pump. In this case, the description in FIG. 3 will be omitted by using the same reference numerals as described above.

As explained above, the transmission device of this invention connects the driving side crankshaft of the prime mover and the driven side crankshaft of the reciprocating pump via a planetary gear reduction mechanism, so that the reduction ratio can be maintained within a range. This makes it possible to fully demonstrate the ability of the prime mover during high-speed rotation by widening the rotation speed, and eliminates the difficulty of starting due to synchronization of the strokes of the reciprocating parts of the prime mover and pump. Since the load can be distributed evenly by the multiple planetary gears, it is possible to create a compact structure with excellent strength using inexpensive materials. By freeing the internal gear part, it has excellent effects such as being able to stop only the pump, and its utility value is remarkable.

[Brief explanation of the drawing]

1A and 1B are schematic plan views and side views showing the structure of a conventional transmission device, and FIGS. 2A and 2B are schematic plan views and side views of essential parts of the structure of the transmission device of this invention. 3 is a sectional view showing a specific example of the transmission device of this invention. In the figure, 1...piston of the prime mover, 3...
Drive side crankshaft, 4... Plunger of reciprocating pump, 6... Driven side crankshaft, 7... Planetary gear reduction mechanism, 8... Pinion, 9... Planetary gear, 1
0... Crown internal gear, 11... Planetary gear shaft.

Claims (1)

[Scope of utility model registration request] A planetary gear reduction mechanism is used to connect the drive-side crankshaft that converts the reciprocating displacement of the prime mover into rotational displacement and the driven-side crankshaft that converts the rotational displacement into reciprocating displacement and transmits the reciprocating displacement to the reciprocating pump. A transmission device for a backpack-type power sprayer, etc., which is connected via a