JPH077647Y2 - Transmission mechanism for hand-held powered work machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a transmission mechanism suitable for being installed in a hand-held power working machine.

<Prior Art> As a hand-held power-operated small work machine, for example, a pillar such as a vinyl house should be buried in the ground,
A work machine for drilling is known, in which a work power take-off shaft is hung from a hand-held installation base of a small engine through a transmission mechanism, and a drill is drilled by a coupling to the lower end of the power take-out shaft. Attach this to the high speed of about 200 rpm by the power of the engine,
And it is designed to rotate in one direction.

<Problems to be solved by the invention> However, in the above-mentioned transmission mechanism of the working machine, the work power take-out shaft is designed to rotate at high speed. Since it will be rotated, it cannot be used in a stable and handheld manner, and it is necessary to completely enclose the engine for safety.
Moreover, since the rotation direction of the power take-out shaft is one direction and is not reversible, the type of work by the rotary power taken out from this is limited to mere drilling. The machine itself cannot be used for a wide range of purposes.

Therefore, it is conceivable to switch the direction of rotation of the power take-off shaft between forward and reverse, or further reduce the speed.However, in the case of this type of small working machine with power, it is possible to secure a light weight for handheld use and an overall weight balance. While satisfying such requirements, it is never easy to design the rotation direction forward / reverse switching mechanism and multi-stage speed reduction mechanism as a compact and compact transmission mechanism. is not.

<Means for Solving the Problem> The present invention intends to solve such a problem, and because of the structure for that purpose, the transmission case is fixedly installed on the installation base of the small engine, and the work case is connected to the transmission case. A power-equipped work machine that is in a hanging state substantially along its own center of gravity and has a work power take-out shaft that is driven to rotate by an engine is led out and that uses a frame frame handed out to surround the engine from the installation base. In the above, the intermediate gear shaft is laid on the power take-off shaft on the same vertical line as the stacked state with respect to the power take-off shaft and is rotatably supported, and the input gear shaft and the detour transmission are made to the left and right adjacent positions of the intermediate gear shaft. A pair of gear shafts are both laid freely freely and hung vertically in parallel including the power take-off shaft, and the input gear shaft is provided with a centrifugal clutch mechanism. Then, the first pinion gear engraved on the input gear shaft is connected to the output shaft of the engine, and is engraved on the intermediate gear shaft to the large first reduction gear that overhangs correspondingly from the intermediate gear shaft. The second pinion gear thus formed is constantly meshed with the second reduction gear having a large diameter, which extends correspondingly from the bypass transmission gear shaft. A forward rotation third reduction gear and a reverse rotation third reduction gear corresponding to a pair of upper and lower third pinion gears are respectively fitted onto the power take-off shaft so as to freely rotate, and the forward rotation third pinion gear and the third reduction gear Is always meshed, while the third pinion gear for reverse rotation and the third reduction gear are constantly meshed via an idle gear, and the third reduction gear for forward rotation and the third reduction gear for reverse rotation are connected. Interspersed between the top and bottom And an up-and-down slider for selectively switching the forward and reverse rotation directions, which is selectively engaged with both the third reduction gears, is spline-fitted to the power take-off shaft so as to be integrally rotatable with each other. is there.

<Example> The drawing shows the present invention applied to a spiral pile driving work machine. First, in the overall external view of Figs. 1 to 4,
(E) is a small and lightweight air-cooled high-speed engine, and (10) is a mounting base on which the engine (E) is mounted and fixed. The ground ( It can be stably placed in A). (F) is a frame of metal pipe material that is also integrally projected from the installation base (10) in order to safely surround the engine (E), and is bent into an almost inverted U-shape in a front view. It is composed of a combination of a handbag arch (12) and an operation handle (13) which is bent in an almost inverted hat shape in plan view.

The carrying arch (12) crosses the central part of the upper surface of the engine (E) while standing up from the left and right ends of the installation base (10), and grips the crossing bar part (12a).
The work machine itself can be carried around and moved. On the other hand,
When viewed from the front, the operation handle (13) is located at a middle height of the carrying arch (12) and horizontally crosses the rear surface of the engine (E), and the crossing bar portion (13a).
Protects the engine (E) from touching the body, and a pair of left and right handle grips (14) are integrally fitted to both ends of the installation base (10) that project laterally. It is possible to work while holding the handle grip (14) with both hands.

In that case, the right end of the operation handle (13) is bent back toward the rear in a smooth arc shape, and the sled is provided with the slot lever (15) of the handle (E) by the band metal fittings. Installed. Similarly, the left end portion of the operation handle (13) has a so-called straight pipe shape, and a stop button (16) for the engine (E) is installed here.

That is, as is apparent from the plan view of FIG. 2, the left end portion and the right end portion of the operation handle (13) are in a relation of intersecting each other while maintaining a substantially right angle (γ), which allows the handle to be operated. While holding the grip (14) with both hands, it is possible to perform work stably without swinging of the working machine itself. Incidentally, (17) is a recoil starter of the engine (E), and (18) is a fuel tank.

(19) is a transmission case that is fixedly integrated with a plurality of bolts (20), etc. in a suspended state to the center of the installation base (10), and is located directly below the engine (E). The saucer part (19a) protruding upward from the eccentric part of the mesh case (19).
And the corresponding clutch case (21) is formed between them by the fitting and integration of the bowl (19b) protruding downward from the engine (E) side correspondingly.

(C) is a centrifugal clutch mechanism enclosed and installed in the clutch case (21). The output shaft (22) from the engine (E) rotates at high speed, and a tension coil spring ( As soon as the set tension of (23) is overcome, the centrifugal frictional force of the clutch lining (24) serves for transmission. (25) shows a mounting bolt of the clutch mechanism (C) to the output shaft (22) of the engine (E).

Further, since the rotational power of the engine (E) is intermittently transmitted to the transmission mechanism described later through the centrifugal clutch mechanism (C), a separate operating lever for controlling the intermittent operation is provided. It is not necessary to install, and it is sufficient to operate the slottle lever (15) lightly with one hand.

(26) is a work power take-off shaft derived from the case (19) as a hanging state substantially along the entire center of gravity (Y-Y) of the work machine itself, and an engine (E).
Reduction gear mechanism (G) that transmits the rotational power of
And a transmission mechanism (T) including a rotation direction switching mechanism (R) for rotating the power take-off shaft (26) in the forward and reverse directions is incorporated in the transmission case (19).

That is, the transmission mechanism (T) will be described next. In FIG. 5 and FIGS. 7 to 10 in which the transmission mechanism is extracted, (27) is the same vertical line (center of gravity line) with the power take-off shaft (26). The intermediate gear shafts (28) and (29) which are located on the Y-Y) and are arranged in a stacked state to the upper stage of the take-out shaft (26). To the next position,
It is an input gear shaft and a bypass transmission gear shaft that are vertically installed in parallel.
A transmission drum (30) for connecting and disconnecting with the clutch lining (24) of the centrifugal clutch mechanism (C) is assembled and integrated at the upper end of the input gear shaft (28) which faces the clutch case (21). ing. Then, the first pinion gear (31) having a small diameter engraved on the circumferential surface of the input gear shaft (28) meshes with the first reduction gear (32) protruding from the intermediate gear shaft (27) to a large diameter. The primary deceleration action is performed between them.

(33) is a second pinion gear having a small diameter engraved on the circumferential surface of the intermediate gear shaft (27), and this is a second reduction gear (34) which extends from the bypass transmission gear shaft (29) to a large diameter. ) Is kept in mesh. Therefore, the secondary deceleration action is performed in the mushroom.

In addition, at the location where the bypass transmission gear shaft (29) faces almost the upper half of the power take-off shaft (26), the third pinion gear for reverse rotation (35) and the third pinion gear for reverse rotation (36) are also provided. The upper and lower pairs are also engraved. Both the upper and lower ends of the bypass transmission gear shaft (29) are borne by the upper and lower walls of the transmission case (19) through needle bearings (37) and (38), on the other hand, the intermediate gear shaft. The upper end of (27) goes to the upper wall of the case (19), and the lower end goes to the upper end of the power take-off shaft (26). Needle bearings (39)
It is also rotatably supported via (40).
(41) is the above-mentioned input gear shaft (28) in the case (1
9) A ball bearing for supporting the upper wall.

The lower half portion of the power take-off shaft (26) is stably borne by the movement case (19) through the plurality of ball bearings (42), and similarly in the upper half part of the take-out shaft (26). Is the third pinion gear (3
5) A pair of upper and lower parts of a third forward reduction third reduction gear (43) corresponding to (36) and a reverse third rotation reduction gear (44) are loosely fitted at regular intervals. .

The third forward reduction third reduction gear (43) meshes with the third forward rotation pinion gear (35) of the bypass transmission gear shaft (29), but is more forward than the third pinion gear (35). The diameter of the third reduction gear (43) is larger, and accordingly, the power takeoff shaft (26) is thirdly reduced between the meshes thereof. On the other hand, the lower reverse third reduction gear (44) is
As is clear from FIG. 10, the bypass transmission gear shaft (29) is connected via the idle gear (46) on the idle gear shaft (45) vertically installed in parallel with the bypass transmission gear shaft (29). It is in a state of meshing with the reverse third pinion gear (36).

Then, the diameter dimension of the third reverse reduction gear (44) (D
1) is set smaller than the third forward reduction third reduction gear (43) by a slight dimension (W), and is meshed with the reverse third pinion gear (36) through the idle gear (46). Therefore, even when the power take-off shaft (26) is reversely rotated, the take-out shaft (26) is decelerated.

In that case, in the figure, the rotation at the time of normal rotation, which should drive the spiral pile, is slightly slower than at the time of reverse rotation, at which the spiral pile should be pulled out, at a speed of about 60 to 90 rpm. However, on the contrary, it is of course possible to set the number of teeth so as to rotate a little faster, or to rotate at the same speed of the above operations.

(47) is the third reduction gear for forward rotation and reverse rotation (43) (44)
Is an up-and-down slider for switching between forward and reverse rotation directions, which is spline-fitted to the power take-off shaft (26) while being positioned between the upper and lower sides of the shift take-off arm (48). Recessed circumferential groove (5
0) has been formed. However, even in the normal engagement state, the elevating slider (47) can rotate integrally with the power take-off shaft (26).

The shift rod (48) is vertically inserted into the lower wall portion of the mesh case (19) in a vertical state parallel to the power takeoff shaft (26), and the shift case (19) is inserted from the upper end portion or the lower end portion thereof. It is adapted to be slid up and down by a forward / reverse rotation direction switching operation lever (51) led out of 19). (52) is the switching lever (5
The rotation fulcrum part (1), (53), similarly, indicates a pivotal connection pin between the operation lever (51) and the shift rod (48).

(54) is a forward / reverse rotation direction switching pin integrally press-fitted into the body surface of the lifting slider (47) in a penetrating state, and is associated with the lifting operation of the lifting slider (47) by the switching operation lever (51). Selectively engage with the upper third rotation reduction gear (43) or the lower third rotation reduction gear (44),
The gears (43) (44) are integrally rotated with the power take-off shaft (26).

That is, both the forward and reverse third reduction gears (43)
The rotation direction switching mechanism (R) of the power take-off shaft (26) is formed by the (44) and the elevating slider (47) equipped with the switching pin (54). 43 and (44) also function as gears forming the reduction gear mechanism (G) of the power take-off shaft (26). Therefore, (55) and (56) are pin receiving holes formed correspondingly to the body surfaces of the forward rotation third reduction gear (43) and the reverse rotation third reduction gear (44), respectively. Although the body surface is opened in a penetrating state, it does not matter if the recess is formed in the non-penetrating state.

According to the transmission mechanism (T) of FIGS. 7 and 9,
Forward / reverse rotation direction switching pin (54) of the lifting slider (47)
However, since it is now engaged with the upper third rotation reduction gear (43) for forward rotation, the transmission case (19) is passed from the output shaft (22) of the engine (E) through the centrifugal clutch mechanism (C). ) Is introduced into the input gear shaft (2
8) 1st pinion gear (31) 1st reduction gear (32)
Second pinion gear (33) Second reduction gear (34) Forward rotation third pinion gear (35) Forward rotation third reduction gear shaft (43)
The power is transmitted to the power take-off shaft (26) via the up-and-down slider (47), and the take-out shaft (26) is normally rotated.

Then, the switching operation lever (51) is rotated from the normal rotation state of FIGS. 7 and 9, and the switching pin (54) of the elevating slider (47) is moved to the lower reverse third reduction gear (44). ), When the elevating slider (47) is lowered as shown in FIGS. 8 and 10, the detour transmission gear shaft (2
The rotational power transmitted to the second reduction gear (34) in 9) is
Next, the 3rd pinion gear (36) for reverse rotation of the bypass transmission gear shaft (29) and the idle gear (46) of the idle gear shaft (45)
Since the power is transmitted to the power take-off shaft (26) by way of a detour via the third reverse reduction gear (44) lifting slider (47), the take-out shaft (26) is reversely rotated. Therefore, in both forward and reverse rotations, the reduction gear mechanism (G) described above gives the power take-off shaft (26) a total of three reduction ratios.

The lower end of the power take-off shaft (26) is located in the mesh case (1
Exposed from 9) is as suggested from Fig. 5, but at the lower end part of which a coupling (57) for receiving the spiral pile (M) is integrated with the power take-off shaft (26). Rotatably mounted, spiral pile (M) against ground (A)
Will be used for driving or drawing.

As shown in FIGS. 11 to 19, the coupling (57) is the same as the mounting base cylinder (57a) that is detachably fitted onto the power take-off shaft (26) and the lower end of the base cylinder (57a). It consists of a large diameter control cylinder (57b) that continuously projects in a core-related state and receives the hook-shaped head (58) of the spiral pile (M).
The base cylinder (57a) is fixed via the penetrating pin (59) so as to rotate integrally with the power takeoff shaft (26).

In addition, the control cylinder (57b) is so designed that the head (58) of the spiral pile (M) is removably received so that both the receiving depth and the diameter thereof are larger than the diameter of the hook-shaped head (58). The partition wall (60) is located in the inner part of the control tube (57b).
Is also provided, and the chucking groove (S) is detachably engaged with the head (58) of the received spiral pile (M).
Is divided by the partition wall (60). The head (58) is received and held in the checking groove (S) in a restrained state, and the spiral pile (M) is taken out by the power take-off shaft (26).
As a result, not only idling but also reliable rotation can be achieved without transmission loss.

In this respect, in FIG. 11 to FIG. 19, the partition wall (60) for partitioning the checking groove (S) extends parallel from the lower end of the mounting base cylinder (57a) toward the inner rear part of the restriction cylinder (57b). By forming it into a bifurcated shape, the checking groove (S) is opened in a letter shape in bottom view, and the bifurcated partition wall (60) is restricted to the mounting base cylinder (57a) (57b). The restriction tube (57b) is also welded and integrated with this as a mounting piece for.

(A), (b), (c), (d), (e), and (f) are restricted cylinders (57
It is a plurality of windows formed on the body surface or the upper surface of b) so as to communicate with the inside of the checking groove (S), and open in the circumferential direction and the vertical direction. Therefore, if a clod or other foreign matter adheres or accumulates inside the control cylinder (57b), insert a foreign matter scraping tool (61) such as a rod through the windows (a) to (f). The foreign matter can be scraped off easily and reliably.

Reference numeral (62) is a guide mark that informs the outside of the division position of the checking groove (S) so that the guide cylinder (57b) of the coupling (57) or the outer peripheral surface of the mounting base cylinder (57a) can be visually checked. Has been granted. The guide mark (6
2) As shown in Figs. 11 to 19, the coloring color is identifiable, but as long as it is based on that purpose, the mounting base cylinder (57
a) and ribs protruding from the outer peripheral surface of the control tube (57b)
You may make it function as a guide mark (62). By visually observing the guide mark (62) from the outside, it is possible to detect the position of the hook-shaped head (58) with respect to the chucking groove (S) of the regulation tube (57b) from the outside. It can be done.

Further, (63) is a skirt flange which is slightly outwardly bent and expanded from the lower end opening edge portion of the regulation cylinder (57b), and the head portion (58) of the spiral pile (M) is inside the coupling (57). When the spiral pile (M) is once received and rotated by the power take-off shaft (26), the spiral pile (M) is floated from the ground (A) by the centrifugal force of the rotation. At the same time, it works to prevent the danger of swinging in a horizontal position. That is, as shown in FIG. 19, the straight neck portion (64) of the spiral pile (M) should strike the skirt flange (63) as soon as possible, and regulate the spiral portion (65) so that it always faces downward. , The expansion angle (θ) within a certain range (acute angle) is given.

As is clear from FIG. 5, the lower end of the coupling (57) attached to the power take-off shaft (26) is shorter than the ground stand (11), and when it is placed on the ground (A). , Interim control cylinder in coupling (57) (57
A certain ground height (H) is ensured between the lower end of b) and the ground (A).

<Operation> When the spiral pile (M) is driven into the ground (A) using the work machine as described above, the spiral portion of the spiral pile (M) is first moved as shown in FIG. 22 (I). Stick (65) into the ground (A),
Fix it in the temporary upright state. Next, as shown in FIG. 2 (II), while holding the operating handle (13) of the working machine with both hands and carrying it, the head (58) of the spiral pile (M) is received and set inside the coupling (57). .

After making such preparations, the throttle lever (15) of the engine (E) is operated, and the rotational power from the output shaft (22) is transmitted by the centrifugal clutch mechanism (C) to the transmission mechanism ( T) and the power take-off shaft (26) is rotated forward.

Then, at the beginning of the rotation of the coupling (57), the checking groove (S) in the regulating tube (57b) is self-contained as shown in FIGS. 58) is received and engaged, and therefore, under such a restrained state, one-handed operation of the throttle lever (15) increases the rotation speed of the engine (E) to bring the work machine to the ground ( As shown in (III) of the same figure, if it is pushed down and advanced, the spiral part (65) of the spiral pile (M) is instantaneously buried in the ground (A) for a few seconds, and finally, as shown in FIG. As a result, the driving completion state of the spiral pile (M) as in (IV) can be obtained.

Further, when the spiral pile (M) is prevented from hitting an obstacle or the like in the ground during the above-mentioned driving work, or when the driving place is changed in response to a demand such as the dismantling or relocation of the house, the work is performed. After manually operating the forward / reverse rotation direction switching operation lever (51) of the machine, reversely rotate the coupling (57) by the power take-off shaft (26) from the state of FIG. 22 (III),
The work machine may be pulled up from the ground (A) so as to return to the state shown in FIG. By such an operation, the spiral pile (M) can be instantaneously pulled out from the ground (A).

In this case, the power take-off shaft (26) is decelerated to about 60 to 90 rpm regardless of whether it is rotating normally or reversely, so that the work in handheld use is excellent in safety. Particularly, as described above, the spiral pile (M) is driven by the forward rotation of the power take-off shaft (26), and the pulling work is also performed by the reverse rotation, and the former is set to rotate a little later than the latter. If this is done, it can be said that it is even more useful because it is possible to effectively counter a large load during the driving work, while the pulling-out work can be completed quickly.

At the end of the pulling work, the spiral pile (M) is on the ground (A).
When the skirt flange (63) is provided at the lower end portion of the socket (57) as described above, the skirt flange (63) is swung around when it is floated from the ground and is about to be swung in a horizontal posture by receiving the centrifugal force. There is no danger, and when the engine (E) is stopped, the head (58) of the spiral pile (M) will drop by its own weight from the coupling (57). Therefore, it is not necessary to artificially extract the spiral pile (M) from the coupling (57).

Further, the clods and other foreign matter adhered / accumulated inside the coupling (57) can be removed from the windows (a) to (f) opening on the upper surface of the control cylinder (57b) or the body surface, such as common bar materials. By inserting the scraping tool (61), the scraping tool can be surely scraped off.

<Effects of the Invention> As described above, according to the present invention, the transmission case (19) is fixedly installed on the installation base (10) of the small engine (E), and the center of gravity of the working machine itself is attached to the transmission case (19). The work power take-off shaft (26) driven to rotate by the engine (E) is led out in a hanging state substantially along the line (Y-Y), and the engine (E) is surrounded from the installation base (10). In a power-equipped work machine that uses the frame frame (F) that is pulled out by hand, an intermediate gear shaft (27) is stacked on the power extraction shaft (26) on the same vertical line as the power extraction shaft (26). And is rotatably supported, and the pair of the input gear shaft (28) and the bypass transmission gear shaft (29) are both freely rotatable to the left and right adjacent positions of the intermediate gear shaft (27). Include power take-off shaft (26) The input gear shaft (28) is hung in parallel, and is connected to the output shaft (22) of the engine (E) via the centrifugal clutch mechanism (C) in a power transmission manner, and is engraved on the input gear shaft (28). The first pinion gear (31) to the large first reduction gear (32) correspondingly protruding from the intermediate gear shaft (27), and the second pinion gear (33) also engraved on the intermediate gear shaft (27). ) Correspondingly overhangs the bypass transmission gear shaft (29) and has a large diameter reduction gear (34)
To the forward transmission third reduction gear (35) and the forward rotation third pinion gear (36), which are always meshed with each other and are engraved on the detour transmission gear shaft (29), respectively, corresponding to the upper and lower pairs of the forward rotation third pinion gear (36). 43) and the reverse rotation third reduction gear (44) are fitted onto the power take-off shaft (26) so as to freely rotate, and the forward rotation third pinion gear (35) and the third reduction gear (43) are provided. Is always meshed, while the third pinion gear (36) for reverse rotation and the third reduction gear (44) are constantly meshed via the idle gear (46), and the third rotation reduction gear for forward rotation is also provided. (43) and the third reverse reduction gear (44) are interposed between the upper and lower parts, and are selectively engaged with both the third reduction gears (43) and (44) for switching between forward and reverse rotation directions. The lift slider (47) is spline-fitted to the power take-off shaft (26) so as to rotate integrally with each other. ,
As a transmission mechanism (T) of a power-equipped work machine that is used by hand in this kind, it can be reasonably equipped with its small size and compactness, and nevertheless, work power that is different in the forward and reverse directions of rotation and multi-stage deceleration It can also be used for various types of work because it can take out the work power that has been used.

That is, the pair of upper and lower third reduction gears for forward rotation (43) and the third reduction gear for reverse rotation (44) fitted on the work power output shaft (26).
As it literally has both the function of switching the forward / reverse rotation direction of the power take-off shaft (26) and the same function of deceleration, the power of the elevator slider (47) can be used for both forward and reverse rotation. The take-out shaft (26) can be decelerated in multiple stages.

Moreover, the intermediate gear shaft (27) is supported so as to be stacked on the same vertical line (the center line YY of the working machine itself) of the power take-off shaft (26) and the intermediate gear shaft (27). The input gear shaft (28) and the bypass transmission gear shaft (29) are vertically hung parallel to each other on both left and right sides of the, and between the meshing engagement between the input gear shaft (28) and the intermediate gear shaft (27). ,
The primary deceleration action of the power take-off shaft (26) is set so that the subsequent secondary deceleration action is performed between the meshes of the intermediate gear shaft (27) and the bypass transmission gear shaft (29). Therefore, the transmission mechanism (T) can be remarkably rationalized as a whole, and it not only helps to reduce the size and weight of the working machine itself, but also the weight balance of the machine itself as a model for hand-held use of this kind. It can be optimally secured, and the frame (F) can be stably gripped and used.

[Brief description of drawings]

1 to 4 are overall appearance front view, plan view, left side view and right side view of the spiral pile driving work machine to which the present invention is applied, and FIG. 5 is the installation of a clutch case and a transmission case on the installation base. FIG. 6 is a partially enlarged sectional view showing a state, FIG. 6 is a schematic plan view of the centrifugal clutch mechanism, and FIGS. 7 and 8 are sectional views showing a forward rotation state and a reverse rotation state of the power take-off shaft, respectively.
The figure is a sectional view taken along the line 9-9 of FIG. 7, and FIG. 10 is the section 10-10 of FIG.
11 is a sectional view taken along the line, FIGS. 11 to 13 are plan views showing the coupling extracted, a front view and a side view, and FIGS. 14 and 15 are 14-1 of FIG.
Sectional views along the lines 4 and 15-15, Figure 16 is 16-16 of Figure 12.
FIG. 17 is a front sectional view showing a receiving engagement state of the spiral pile with respect to the coupling, and FIG. 18 is 18-1 in FIG.
8 is a sectional view taken along line 8, FIG. 19 is a side sectional view showing a steady state of the spiral pile corresponding to FIG. 18, and FIGS. 20 and 21 are side views and an enlarged bottom view showing the spiral pile extracted, and FIG. Drawings (I)-(IV) are explanatory views showing a driving operation process of a spiral pile. (10) …… Installation stand (11) …… Grounding stand (14) …… Handle grip (15) …… Slottle lever (19) …… Transmission case (21) …… Clutch case (26) …… Power Extraction shaft (27) …… Intermediate gear shaft (28) …… Input gear shaft (29) …… Detour transmission gear shaft (31) (33) …… First and second pinion gears (32) (34) …… First 2 Reduction gear (35) …… Forward rotation third pinion gear (36) …… Reverse rotation third pinion gear (43) …… Forward rotation third reduction gear (44) …… Reverse rotation third reduction gear (46)… … Idle gear (47) …… Lifting slider (48)… Shift rod (51)… Switching lever (54)… Switching pin (57)… Coupling (C)… Centrifugal clutch mechanism (E)… … Engine (F)… Frame frame (G)… Reduction gear mechanism (M)… Spiral pile (R ...... rotational direction switching mechanism (T) ...... trans honey Chillon mechanism (Y-Y) ...... gravity line

Claims (3)

[Scope of utility model registration request] 1. A transmission case (19) is fixedly installed on an installation stand (10) of a small engine (E), and the center of gravity (Y-
Y), a work power take-off shaft (26) driven to rotate by the engine (E), and a frame extended from the installation base (10) so as to surround the engine (E). In a power-equipped work machine that uses a frame (F) by hand, an intermediate gear shaft (27) is placed on the same vertical line as the power take-off shaft (26) in a stacked state with respect to the power take-off shaft (26) and is idle. A pair of an input gear shaft (28) and a bypass transmission gear shaft (29) are both rotatably supported and rotatably supported on both sides of the intermediate gear shaft (27). 26) including the above, the input gear shaft (28) is transmission-coupled to the output shaft (22) of the engine (E) through the centrifugal clutch mechanism (C). ) The first pinion gear (31) From the gear shaft (27) to the correspondingly enlarged first reduction gear (32), the second pinion gear (33) also engraved on the intermediate gear shaft (27) is connected to the bypass transmission gear shaft (29). Large reduction gear (34) that overhangs correspondingly
To the forward transmission third reduction gear (35) and the forward rotation third pinion gear (36), which are always meshed with each other and are engraved on the detour transmission gear shaft (29), respectively, corresponding to the upper and lower pairs of the forward rotation third pinion gear (36). 43) and the reverse rotation third reduction gear (44) are fitted onto the power take-off shaft (26) so as to freely rotate, and the forward rotation third pinion gear (35) and the third reduction gear (43) are provided. Is always meshed, while the third pinion gear (36) for reverse rotation and the third reduction gear (44) are constantly meshed via the idle gear (46), and the third rotation reduction gear for forward rotation is also provided. (43) and the third reverse reduction gear (44) are interposed between the upper and lower parts, and are selectively engaged with both the third reduction gears (43) and (44) for switching between forward and reverse rotation directions. The lifting slider (47) is spline-fitted to the power take-off shaft (26) so as to rotate integrally with each other. The transmission mechanism of a power-equipped work machine that is used by hand. 2. The body surface of the elevating slider (47) when the elevating slider (47) is selectively engaged with the forward rotation third reduction gear (43) and the reverse rotation third reduction gear (44). , The forward / reverse rotation direction switching pin (54) is integrally press-fitted in a vertically penetrating state, and the receiving holes (55) (56) of the switching pin (54) are connected to both third reduction gears (43). The transmission mechanism of a power-equipped work machine for handheld use according to claim 1, wherein the transmission mechanism is formed on the body surface of (44). 3. A shift rod (48) in which a concave peripheral groove (50) is provided on the circumferential surface of a lift slider (47), and an arm (49) engaging with the concave peripheral groove (50) is extended. The shift rod (48) is vertically inserted into the transmission case (19), and the shift rod (48) is pivotally connected to the forward / reverse rotation direction switching operation lever (51), and the transmission case (51) is connected by the lever (51). The transmission mechanism for a hand-held power working machine according to claim 1, wherein the shift rod (48) is set up and down from the outside of (19).