JP2009127493A - Gas engine mounted working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas engine mounted working machine which simplifies a gas cylinder cover member and prevents the intrusion of a foreign matter such as dust in a mouthpiece mounting part in a state that a cassette gas cylinder is not mounted. <P>SOLUTION: A gas engine mounted working machine 10 is provided with a main cover member 91 arranged in the vicinity of a cassette gas cylinder 18 so as to be openable and closable, and for covering a substantially lower half 18b of the cassette gas cylinder 18 in a closed state. A mouthpiece mounting part 73 for mounting a mouthpiece part 81 of the cassette gas cylinder 18 therein is provided to a space 79 covered with the main cover member 91. The main cover member 91 is provided with a sub-cover member 93 for blocking the space 79 when the cassette gas cylinder 18 is not mounted. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gas engine-equipped working machine equipped with a gas engine that receives fuel from a cassette gas cylinder.

In the cultivator, a gas engine is mounted on the work implement body, a handle post extends from the work implement body toward the rear upper side, a storage case is provided along the handle post, and the storage case lid is opened to open the cassette. There is a gas engine-equipped working machine in which the entire gas cylinder is stored in a storage case (see, for example, Patent Document 1).
JP-A-10-131809

In this gas engine-equipped working machine, a base attaching portion for attaching a base portion of a cassette gas cylinder is provided inside the storage case.
Therefore, the base part of the cassette gas cylinder stored in the storage case can be attached to the base attachment part.

Furthermore, according to this gas engine-equipped working machine, the internal space of the storage case can be closed by closing the cover of the storage case even when the cassette gas cylinder is not installed.
Therefore, it is possible to prevent foreign matters such as dust from entering the cap mounting portion in the storage case when the cassette gas cylinder is not attached.

The storage case of Patent Document 1 is formed to store the entire cassette gas cylinder. For this reason, the structure of the storage case becomes complicated, which has been an obstacle to reducing the cost.
As a countermeasure, it is possible to simplify by providing a gas cylinder cover member that covers only a part of the cassette gas cylinder instead of the storage case that accommodates the entire cassette gas cylinder.

However, when the gas cylinder cover member that stores only a part of the cassette gas cylinder is provided, the internal space of the gas cylinder cover member cannot be closed when the cassette gas cylinder is not attached.
For this reason, when the cassette gas cylinder is not attached, it is conceivable that foreign matters such as dust enter the base mounting portion in the gas cylinder cover member.

  The present invention provides a gas engine-equipped working machine capable of simplifying a gas cylinder cover member and preventing foreign matters such as dust from entering a base mounting portion when a cassette gas cylinder is not attached. Let it be an issue.

  The invention according to claim 1 is a gas engine-equipped working machine equipped with a gas engine that receives fuel supplied from a cassette gas cylinder, and is provided in the vicinity of the cassette gas cylinder so as to be openable and closable, and a part of the cassette gas cylinder in a closed state. A gas cylinder cover member that covers the gas cylinder cover member, and has a base attachment portion that attaches the base portion of the cassette gas cylinder to the space covered by the gas cylinder cover member. Further, a sub cover member for closing the space is provided.

  According to a second aspect of the present invention, there is provided a shutter member that closes the base attaching portion when the cassette gas cylinder is not attached.

  5. The sub cover member according to claim 3, wherein the sub cover member is formed so as to press a portion of the cassette gas cylinder exposed from the gas cylinder cover member when the cassette gas cylinder is mounted.

In the invention which concerns on Claim 1, the gas cylinder cover member which covers a part of cassette gas cylinder was provided.
Thereby, since it is not necessary to cover the entire cassette gas cylinder with the gas cylinder cover member, there is an advantage that the gas cylinder cover member can be simplified.

Furthermore, a base attachment part for attaching the base part of the cassette gas cylinder is provided in the space covered with the gas cylinder cover member, and the sub cover member is provided in the gas cylinder cover member. The sub-cover member can block the space (internal space) covered with the gas cylinder cover member when the cassette gas cylinder is not installed.
Accordingly, there is an advantage that foreign matters such as dust can be prevented from entering the base mounting portion when the cassette gas cylinder is not attached.

The invention according to claim 2 includes a shutter member that closes the base attaching portion when the cassette gas cylinder is not attached.
Therefore, it is possible to close the space covered with the gas cylinder cover member with the sub-cover member, and to close the base attachment portion with the shutter member, and the structure for closing the base attachment portion can be a double structure.
As a result, it is possible to more reliably prevent foreign matters such as dust from entering the base mounting portion, and there is an advantage that, for example, the foreign matter intrusion prevention function during long-term storage can be improved.

In the invention according to claim 3, the sub cover member is formed so as to press down a portion of the cassette gas cylinder exposed from the gas cylinder cover member when the cassette gas cylinder is mounted.
Thereby, it becomes possible to press down the part exposed from the gas cylinder cover member among the cassette gas cylinders with the sub cover member, and there is an advantage that the cassette gas cylinder can be prevented from vibrating.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. Note that “front”, “rear”, “left”, and “right” indicate Fr as the front, Rr as the rear, L as the left, and R as the right according to the direction viewed from the operator.
In addition, in this Embodiment, a walk-type tiller is illustrated as a gas engine mounting working machine, However, a gas engine mounting working machine is not limited to a walking tiller.

FIG. 1 is a side view showing a gas engine mounted working machine according to the present invention.
The gas engine-equipped working machine 10 is a walking type tiller that travels while cultivating soil with a plurality of tilling claws 13 by transmitting the power of the gas engine 11 to the tilling shaft 12 and rotating the tilling shaft 12. .

  The gas engine-equipped working machine 10 includes a gas engine 11 mounted on the upper end portion of the working machine body 15, a fender 17 provided below the gas engine 11 and the muffler 16, and a tilling shaft 12 below the fender 17. And a plurality of tilling claws 13 provided via the.

The gas engine 11 includes a muffler 16 on the left side.
The tilling shaft 12 is a rotating shaft extending horizontally in the body width direction.
The fender 17 is a cover mainly for the purpose of preventing scattering of earth and sand.
The gas engine 11 is an engine that is driven by supplying fuel gas (fuel) derived from a cassette gas cylinder 18 described later.

Further, the gas engine-equipped working machine 10 includes a support bracket 21 provided on the work machine main body 15, a resistance rod 22 provided on the support bracket 21, and a handle that extends rearward and upward from the support bracket 21. A column unit 24; a gas cylinder holding means 25 provided in the handle column unit 24; a cassette gas cylinder 18 attached to the gas cylinder holding means 25; and an operation handle 26 provided at the upper end of the handle column unit 24. Yes.
The resistance rod 22 is a member that adjusts the tilling depth of the soil by the plurality of tilling claws 13.

The operation handle 26 is a cylindrical member formed in a substantially U shape in a front view (see FIG. 2).
The operation handle 26 has a lower end portion 26a rotatably attached to the upper end portion of the handle column unit 24, and left and right handle portions 26b and 26c extend upwardly from the left and right end portions of the lower end portion 26a toward the rear. The left and right grips 27 and 28 are provided at the rear end.

FIG. 2 is a perspective view showing a state in which a cassette gas cylinder is attached to a working machine equipped with a gas engine according to the present invention.
FIG. 2 shows a state in which the elevating column 32 of the handle column unit 24 is extended upward and the operation handle 26 is held at the uppermost position.
The handle column unit 24 includes a fixed column 31 provided at the rear end 21 a of the support bracket 21, an elevating column 32 provided so as to be movable up and down on the fixed column 31, and a holding means 33 that holds the elevating column 32 in a predetermined position. And.

The fixed column 31 includes a column holding bracket 35 (see also FIG. 1) provided at the rear end portion 21a of the support bracket 21 and left and right fixing post portions 36 and 37 provided at the left and right ends of the column holding bracket 35. I have.
The left and right fixed post portions 36 and 37 are attached to the column holding bracket 35 by welding, and are arranged in parallel to each other at a predetermined interval.
The left and right fixed post portions 36 and 37 are symmetrical pipe members each formed in a cylindrical shape. The elevating column 32 is inserted into the left and right fixed post portions 36 and 37 so as to be movable up and down.

  The elevating column 32 has left and right elevating post portions 41 and 42 inserted into the left and right fixed post portions 36 and 37 so as to be movable up and down, and an elevating post connecting portion 43 that connects upper end portions of the left and right elevating post portions 41 and 42. And a handle receiving portion 44 that spans the upper ends of the left and right elevating post portions 41 and 42, and a handle holding member 45 that holds the operation handle 26 placed on the handle receiving portion 44.

The left and right lifting post portions 41 and 42 are bilaterally symmetrical pipe members each formed in a cylindrical shape. A handle receiving portion 44 is bridged between upper ends of the left and right lifting post portions 41 and 42.
The lower end portion 26 a of the operation handle 26 is placed on the handle receiving portion 44, and the placed lower end portion 26 a is supported from above by the handle holding member 45.

The handle holding member 45 is attached to the elevating post connecting portion 43 with bolts 46, 46 and nuts 47, 47 (see FIG. 3 for the nut 47).
As a result, the lower end portion 26 a of the operation handle 26 is rotatably supported by the handle receiving portion 44 and the handle holding member 45.

FIG. 3 is a cross-sectional view showing a state where a cassette gas cylinder is attached to the working machine equipped with a gas engine according to the present invention.
FIG. 3 shows a state in which the operation column 26 is held at the lowest position by lowering the elevating column 32 of the handle column unit 24.

The handle holding member 45 has a lock plate 51 formed between the left and right lifting post portions 41 and 42 (see FIG. 2 for the left lifting post portion 41).
A first lock hole 51 a is formed in the lock plate 51, and a lock nut 52 disposed coaxially with the first lock hole 51 a is welded to the lower surface of the lock plate 51.
On the other hand, a lock protrusion 53 projects from the lower end portion 26 a of the operation handle 26. A second lock hole 53a is formed so as to protrude from the lock protrusion 53 and the lock plate 51.

A lock protrusion 53 is overlaid on the lock plate 51, and a lock operation screw 54 is inserted into the second lock hole 53a and the first lock hole 51a.
The threaded portion 54a protruding from the first lock hole 51a is screwed to the lock nut 52, so that the operation handle 26 is held at the use position.

The elevating column 32 is held at a predetermined position (predetermined height) by the holding means 33.
The holding means 33 includes a fixed post connecting portion 57 that connects the upper ends of the left and right fixed post portions 36 and 37 (see FIG. 2 for the left fixed post portion 36), and a first portion formed substantially at the center of the fixed post connecting portion 57. 1 holding hole 57a, a slide plate 61 extending downward from the lifting post connecting portion 43, a plurality of second holding holes 61a formed at predetermined intervals in the slide plate 61, and a plurality of second A plurality of holding nuts 62 arranged coaxially with respect to the holding hole 61 a are welded to the back surface of the slide plate 61.
As an example, the plurality of second holding holes 61a are formed at three positions, an upper position, an intermediate position, and a lower position.

As shown in the figure, the second holding hole 61a at the upper position is coaxial with the first holding hole 57a in a state where the operation handle 26 is held at the lowest position by arranging the lifting column 32 at the lowest position. Be placed.
The holding operation screw 63 is inserted into the first holding hole 57a and the second holding hole 61a, and the screw portion 63a protruding from the second holding hole 61a is screwed to the holding nut 62, whereby the lifting column 32 (that is, the operation column 63) The handle 26) is held in the lowest position.

Note that the second holding hole 61a at the intermediate position is arranged coaxially with the first holding hole 57a in a state where the lifting column 32 is pulled up to the intermediate position.
Therefore, the lifting column 32 (that is, the operation handle 26) is held at the intermediate position above the lowest position by the holding operation screw 63 and the holding nut 62.

Further, the second holding hole 61a at the lower position is disposed coaxially with the first holding hole 57a in a state where the lifting column 32 is pulled up to the uppermost position.
Therefore, the lifting column 32 (that is, the operation handle 26) is held at the uppermost position by the holding operation screw 63 and the holding nut 62 as shown in FIG.

The handle column unit 24 is provided with gas cylinder holding means 25.
The gas cylinder holding means 25 includes a base mounting bracket 71 provided between the left fixed post portion 36 and the right fixed post portion 37 (see FIG. 2 for the left fixed post portion 36), and an open / close valve 72 provided on the base mounting bracket 71. A base attaching part 73 provided on the opening / closing valve 72, a gas cylinder holder 74 provided above the base attaching part 73, a gas cylinder cover means 75 provided on the base attaching bracket 71 so as to be opened and closed, and a base attaching part. And a shutter member 78 capable of opening and closing 73.

The open / close valve 72 is connected to a lower supply port (not shown) through a fuel flow path 76 that guides liquid fuel gas, and a switching knob 77 is provided at the left end.
The base attaching part 73 is a member that is provided in a space 79 (see also FIG. 5) covered with the gas cylinder cover means 75 and attaches the base part 81 of the cassette gas cylinder 18.
The base attaching portion 73 is disposed substantially at the center between the left fixed post portion 36 and the right fixed post portion 37 (see FIG. 2 for the left fixed post portion 36).
The base attaching portion 73 will be described in detail with reference to FIG.

The gas cylinder holder 74 is provided between the left fixed post portion 36 and the right fixed post portion 37, and a curved concave portion 74a (see also FIG. 5) is formed at a portion facing the rear side wall of the cassette gas cylinder 18.
By receiving the rear side wall of the cassette gas cylinder 18 at the curved concave portion 74 a of the gas cylinder holder 74, the rear side wall of the cassette gas cylinder 18 is supported by the curved concave portion 74 a.

FIG. 4 is a perspective view showing a state before the cassette gas cylinder is attached to the gas cylinder holding means according to the present invention.
The cassette gas cylinder 18 is a commercially available gas cylinder in which a container 19 is filled with liquefied butane containing butane as a main component (hereinafter referred to as “liquid fuel gas”).
In the cassette gas cylinder 18, a flange 82 is formed in the base part 81 of the container 19, a recess 82 a is formed in the flange 82, and a nozzle 83 projects from the base part 81.

Next, a procedure for attaching the base part 81 of the cassette gas cylinder 18 to the base attachment part 73 will be described.
First, the shutter member 78 is pulled up to the position shown in the figure against the spring force of the coil spring 86 (see FIG. 3).
The shutter member 78 will be described in detail later.

With the shutter member 78 pulled up, the cassette gas cylinder 18 faces downward, the nozzle 83 is aligned with the nozzle receiving port 113 of the base mounting portion 73, and the dent 82 a is aligned with the bending locking piece 114.
The cassette gas cylinder 18 is moved downward as indicated by an arrow A so that the right side portion of the flange 82 is inserted between the bottom 115 of the base attaching portion 73 and the locking pin 116, and the recess 82 a passes through the bent locking piece 114. To do.

By passing the recess 82 a through the bending locking piece 114, the left side portion of the flange 82 is arranged below the bending locking piece 114, and the base 81 (specifically, the flange 82) is brought into contact with the bottom 115. Can be touched.
By bringing the base part 81 into contact with the bottom part 115, the raised part 117 a of the leaf spring 117 is pushed down to the bottom part 115 by the flange 82.

In this state, by rotating the cassette gas cylinder 18 in the counterclockwise direction as indicated by an arrow B, the recess 82 a is displaced from the bent locking piece 114, and the bottom portion 115 and the bent locking piece 114 form the flange 82. The left part is pinched.
Therefore, the right side portion of the flange 82 is sandwiched between the bottom portion 115 and the locking pin 116, and the left side portion of the flange 82 is sandwiched between the bottom portion 115 and the bent locking piece 114.

In this state, the cassette gas cylinder 18 is further rotated by approximately 90 °, whereby the recess 82a of the flange 82 moves to the raised portion 117a of the leaf spring 117.
The pressing force of the raised portion 117 a by the flange 82 is released, and the raised portion 117 a is locked to the recess 82 a of the flange 82.
Thus, the cassette gas cylinder 18 is attached to the base attaching portion 73 in a state where the cassette gas cylinder 18 is positioned by the leaf spring 117.

By attaching the base part 81 to the base attaching part 73, the nozzle 83 is pushed into the container 19 side. Therefore, the inside of the container 19 is communicated with the opening / closing valve 72 through the nozzle 83.
Accordingly, by switching the switching knob 77 of the opening / closing valve 72, the liquid fuel gas stored in the container 19 of the cassette gas cylinder 18 is guided to the gas engine 11 (see FIG. 1) through the fuel flow path 76.

  Returning to FIG. 2, the gas cylinder cover means 75 is disposed between the left and right fixed post portions 36 and 37 along the left and right fixed post portions 36 and 37, and the substantially lower half portion 18 b of the cassette gas cylinder 18 (see FIG. 3). ) And supports the cassette gas cylinder 18.

  The gas cylinder cover means 75 includes a main cover member (gas cylinder cover member) 91 supported by the base mounting bracket 71 so as to be freely opened and closed, a lock mechanism 92 that locks the main cover member 91 in the closed position, and an upper end of the main cover member 91. And a sub-cover member 93 that is supported by the portion so as to be freely opened and closed.

The main cover member 91 is disposed at a position facing the gas cylinder holder 74, and a lower end portion 91a is rotatably supported by the base mounting bracket 71 via left and right support pins 95 (see FIG. 3).
In other words, the main cover member 91 is provided in the vicinity of the cassette gas cylinder 18 so as to be openable and closable, and covers the substantially lower half portion (a part of the cassette gas cylinder) 18b (see FIG. 3) of the cassette gas cylinder 18 in the closed state. It is a member that covers the base attaching portion 73 (see FIG. 3).

The main cover member 91 includes a front wall 97, a left side wall 98 formed on the left side of the front wall 97, and a right side wall 99 formed on the right side of the front wall 97.
The front wall 97 includes a lower half portion formed in a substantially flat plate shape, a bent piece bent rearward from the lower end of the lower half portion, and an upper half extended backward in a curved shape from the upper end of the lower half portion. Part.

An opening 101 (see FIG. 5) is formed in the upper half portion of the front wall 97, and left and right support protrusions 102 protrude from the vicinity of the opening 101.
The opening 101 is an opening through which a substantially upper half portion (exposed portion) 18a of the cassette gas cylinder 18 protrudes upward.
That is, the substantially upper half portion 18 a of the cassette gas cylinder 18 is exposed to the outside of the main cover member 91.

By configuring the main cover member 91 to cover the substantially lower half portion 18 b (see FIG. 3) of the cassette gas cylinder 18, it is not necessary to cover the entire cassette gas cylinder 18 with the main cover member 91.
Thereby, simplification of the main cover member 91 can be achieved.

The sub cover member 93 is formed in a substantially rectangular outer shape, and a lower end portion 93a is rotatably supported by the left and right support protrusions 102 via the left and right support pins 103.
The sub cover member 93 is urged in a direction to close the opening 101 of the front wall 97 by a coil spring 104 attached to the left support pin 103.

Furthermore, the sub-cover member 93 is formed in a curved shape so that the upper end portion 93b contacts the substantially upper half portion 18a of the cassette gas cylinder 18 over a wide range.
Therefore, by using the spring force of the coil spring 104, the cassette gas cylinder 18 can be pressed down over the entire curved upper end portion 93b.
Thereby, it is possible to satisfactorily suppress the vibration of the cassette gas cylinder 18 that is considered to occur during the operation of the gas engine-equipped working machine 10 (see FIG. 1) by the sub cover member 93.

The lock mechanism 92 includes a slide knob 111 slidably attached to the left side wall 98.
By sliding the slide knob 111, the lock state of the lock mechanism 92 is released and the main cover member 91 can be opened.

  Returning to FIG. 3, the outer shape of the shutter member 78 is formed in a substantially rectangular shape (see FIG. 4), and the lower end portion 78 a is supported by the support shaft 85, so that the shutter member 78 rotates to the base mounting bracket 71 via the support shaft 85. It is supported movably.

The left and right end portions of the support shaft 85 are provided on the left and right fixed post portions 36 and 37 (see FIG. 2 for the left fixed post portion 36).
A coil spring 86 is provided on the support shaft 85. The coil spring 86 urges the shutter member 78 in the counterclockwise direction, that is, in the direction to close the base attaching portion 73.

Therefore, in a state where the base part 81 of the cassette gas cylinder 18 is attached to the base attachment part 73, the cassette gas cylinder 18 can be pressed against the front end part 78 b of the shutter member 78 by the spring force of the coil spring 86.
Thereby, it is possible to satisfactorily suppress the vibration of the cassette gas cylinder 18 that is considered to occur during the operation of the gas engine-equipped working machine 10 by the shutter member 78.

FIG. 5 is a perspective view showing a state where the cassette gas cylinder is removed from the gas engine-equipped working machine according to the present invention, and FIG. 6 is a cross-sectional view showing a state where the cassette gas cylinder is removed from the gas engine-equipped working machine according to the present invention. is there.
FIG. 5 shows a state in which the lift column 32 of the handle column unit 24 is extended upward and the operation handle 26 is held at the uppermost position, and FIG. Shows the held state.

As described above, the sub cover member 93 is urged by the coil spring 104 in a direction to close the opening 101 of the main cover member 91.
Therefore, the sub cover member 93 is maintained in a state in which the opening 101 of the main cover member 91 is closed by the spring force of the coil spring 104 when the cassette gas cylinder 18 (see FIG. 2) is not attached.
Thereby, the space 79 covered with the main cover member 91 can be closed, and foreign matter such as dust can be prevented from entering the base attaching portion 73.

As described above, the shutter member 78 is urged in a direction to close the base attaching portion 73 by the coil spring 86.
Therefore, the shutter member 78 is brought into contact with the receiving base 112 (see also FIG. 4) of the base attaching portion 73 by the spring force of the coil spring 86 when the cassette gas cylinder 18 is not attached.
As a result, the nozzle receiving port 113 (see FIG. 4) formed in the receiving table 112 can be closed by the shutter member 78.

As described above, the space 79 covered with the main cover member 91 with the sub cover member 93 can be closed, and the nozzle receiving port 113 can be closed with the shutter member 78. The structure for closing the nozzle receiving port 113 is a double structure. can do.
Accordingly, it is possible to more reliably prevent foreign matter such as dust from entering the nozzle receiving port 113 of the base attaching portion 73, and for example, the function of preventing foreign matter entry during long-term storage can be improved.

In the above embodiment, the example in which the coil spring 86 is used as a means for closing the nozzle receiving port 113 of the base attachment portion 73 with the shutter member 78 has been described. However, the present invention is not limited to this, and other means such as a motor are used. It is also possible to use it.
Furthermore, it is possible to use locking means for locking the shutter member 78 at a position where the nozzle receiving port 113 is blocked.

  Further, the shapes of the main cover member 91, the sub cover member 93, the shutter member 78, and the like exemplified in the above embodiment are not limited to those illustrated, and can be appropriately changed.

  The present invention is suitable for application to a gas engine-equipped working machine equipped with a gas engine that receives fuel from a cassette gas cylinder.

It is a side view which shows the gas engine mounting type working machine which concerns on this invention. It is a perspective view which shows the state which attached the cassette gas cylinder to the gas engine mounting type working machine which concerns on this invention. It is sectional drawing which shows the state which attached the cassette gas cylinder to the gas engine mounting type working machine which concerns on this invention. It is a perspective view which shows the state before attaching a cassette gas cylinder to the gas cylinder holding means which concerns on this invention. It is a perspective view which shows the state which removed the cassette gas cylinder from the gas engine mounting type working machine which concerns on this invention. It is sectional drawing which shows the state which removed the cassette gas cylinder from the gas engine mounting type working machine which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Gas engine mounting type working machine, 11 ... Gas engine, 15 ... Working machine main body, 18 ... Cassette gas cylinder, 18a ... Substantially upper half part (exposed part) of cassette gas cylinder 18, 18b ... Substantially lower half of cassette gas cylinder Part (a part of the cassette gas cylinder), 73 ... base attachment part, 75 ... gas cylinder cover means, 78 ... shutter member, 79 ... space, 81 ... base part, 91 ... main cover member (gas cylinder cover member), 93 ... sub cover Element.

Claims (3)

In a gas engine-equipped working machine equipped with a gas engine that receives fuel from a cassette gas cylinder
A gas cylinder cover member is provided in the vicinity of the cassette gas cylinder so as to be freely opened and closed, and covers a part of the cassette gas cylinder in a closed state,
In the space covered with the gas cylinder cover member, a base attaching part for attaching the base part of the cassette gas cylinder is provided,
A gas engine-equipped working machine comprising a sub cover member that covers the space covered with the gas cylinder cover member when the cassette gas cylinder is not attached to the gas cylinder cover member.   The gas engine-equipped working machine according to claim 1, further comprising a shutter member that closes the base mounting portion when the cassette gas cylinder is not installed.   The said sub-cover member is formed so that the site | part exposed from the said gas cylinder cover member may be pressed down among the said cassette gas cylinders, when the said cassette gas cylinder is mounted | worn. Gas engine mounted work machine.

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