JP2019146503A - Walking type work machine - Google Patents

Abstract

To provide a walking type work machine comprising a hitch to which a work machine is attached on a rear side, and comprising an engine stand on a front side of a transmission case, capable of reinforcing a part of the transmission case receiving a load from an engine stand or a hitch, thereby preventing inconvenience such as oil leakage on the firm transmission case even in severe farm operations.SOLUTION: A walking type work machine is configured to transmit motive force of an engine E mounted on an engine stand 3 provided on a front part of a machine body to a transmission case 1 for driving left/right travel wheels 2L, 2R attached to an axle 6 of the transmission case 1, and attach a work machine to a hitch bracket 8 provided on a rear part of the transmission case 1, the transmission case 1 is sandwiched from left and right sides by a reinforcement connection material 5 for connecting the engine stand 3 and hitch bracket 8, for integrally attaching the reinforcement connection material to the transmission case 1.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a walking work machine that is mainly used for farm work in a farm field or a field.

  There is a walking type tiller described in Patent Document 1 as a walking type working machine.

  In this walking type tiller, an engine stand on which an engine is mounted is provided on the front side and a rotary tiller is mounted on the rear side with respect to a transmission case in which an axle on which a traveling wheel is mounted is pivotally supported on the left and right. And the power from an engine is decelerated within a mission case, a driving wheel is driven, and the tilling shaft of a rotary tiller is driven.

JP 2003-304702 A

  The mission case of the walk-behind work machine is configured with a reduction gear and brake drum inside a hollow case formed by pressing the left and right side wall plates and combining the left and right side wall plates, but mounted on the front engine stand The transmission case receives the weight of the engine and the torsional force when driving the rotary tiller on the rear side, and the right and left side walls are peeled off. There may be a case where a gap is formed on the mating surfaces, causing problems such as oil leakage.

  The present invention is a walking type work machine provided with a hitch that mounts an engine base on the front side of the mission case and a work machine on the rear side, and by reinforcing the part of the mission case that receives a load from the engine base and hitch, It is an object of the present invention to provide a walking-type work machine that does not cause inconveniences such as oil leakage even in intense farm work as a solid mission case.

  The problems of the present invention are solved by the following technical means.

  According to the first aspect of the present invention, the power of the engine (E) mounted on the engine stand (3) provided at the front of the fuselage is transmitted to the transmission case (1) and mounted on the axle (6) of the transmission case (1). In the walking type working machine that drives the left and right traveling wheels (2L, 2R) and attaches the working machine to the hitch bracket (8) provided at the rear part of the transmission case (1), the engine stand (3) and the hitch bracket The walking work machine is characterized in that the transmission case (1) is integrally attached to the transmission case (1) by sandwiching the transmission case (1) from the left and right with the reinforcing connecting material (5) connecting (8).

  The invention of claim 2 is characterized in that the engine base (3), the hitch bracket (8), and the reinforcing connecting member (5) are attached to the transmission case (1) by fastening together. The walking-type work machine is described.

  The invention according to claim 3 is characterized in that a lower connection reinforcing plate (5b1) is provided to sandwich the mission case (1) below the mission case (1). A type work machine.

  In the invention of claim 1, the transmission case 1 receives the load of the weight and driving reaction force of the engine E mounted on the front engine stand 3, and receives the load of the traction of the work machine attached to the rear hitch 4. Since the reinforcing connecting member 5 that connects the engine base 3 and the hitch bracket 8 receives the load together with the transmission case 1 and the left and right side wall plates constituting the transmission case 1 are not separated or broken, there is a problem such as oil leakage. Does not occur.

  In the invention of claim 2, in addition to the effect of claim 1, the transmission case 1, the engine stand 3, and the hitch bracket 8 are assembled using a common mounting hole, so that fewer machining holes are required than when assembled alone. As a result, the number of assembly steps is small, and the manufacturing cost can be reduced.

  In the invention of claim 3, in addition to the effects of claim 1 or claim 2, the lower connection reinforcing plate 5b1 receives the traction load of the engine E and the work implement applied to the lower part of the mission case 1, thereby constituting the mission case 1. This effectively prevents the left and right side wall plates from separating and cracking.

It is a whole perspective view from the left front of a walk type work machine. It is a whole perspective view from the right front of a walk type work machine. It is a top view of a part of walking type work machine. It is a side view of a part of a walking type work machine. It is an enlarged side view of a mission case lower part. It is the figure seen from the upper part in the A section fastening part of FIG. It is the figure seen from the upper part in the B section fastening part, E part fastening part, and F part fastening part of FIG. It is the figure seen from the upper part in the C section fastening part of FIG. It is the figure seen from the upper part in the D section fastening part of FIG. It is the figure seen from the upper part in the FIG. 5E part fastening part. It is a perspective view of the walking type working machine equipped with a wheat roller.

  Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. In the description of the embodiment, the left and right directions in the forward direction of the aircraft are referred to as left and right, respectively, the forward direction is referred to as forward, and the backward direction is referred to as rear. However, the configuration of the present invention is not limited.

  FIG. 1 and FIG. 2 show an overall perspective view of a walking type tiller as a walking type working machine of the present invention.

  A transmission case 1 for supporting the left and right traveling wheels 2L and 2R on the axle 6 is provided at the center of the fuselage, and an engine E is mounted on an engine stand 3 that protrudes from the front of the transmission case 1 and the rear of the transmission case 1 A rotary tiller 9 is mounted on the hitch 4 of the hitch bracket 8 to be attached to. The transmission case 1 has a configuration in which a transmission mechanism is mounted in a hollow that combines left and right side wall plates.

  A balance weight 30 is attached on the front end of the engine base 3 and a stand 31 is provided at the lower part so as to be raised and lowered.

  A recoil starter 35 and an air cleaner 36 are attached to the right side of the engine E, and a fuel tank 37 is attached to the upper part.

  The rotary tilling device 9 is provided with a plurality of tilling claws 9a on the right and left tilling shafts to cultivate the field. The counter chain case 10 provided on the right side surface of the mission case 1 is used for the PTO output shaft of the mission case 1. Power is transmitted from to the tilling shaft.

  Further, the tail wheel (not shown) is moved up and down by the tail wheel adjustment handle 9b so that the rotary tiller 9 can be moved up and down to change the tilling depth.

  Power transmission to the transmission case 1 is performed by a belt transmission clutch mechanism (described later) in a belt cover 19 provided on the left side surface of the transmission case 1.

  Left and right handle rods 12L and 12R branching left and right from the upper part of the mission case 1 are provided, and left and right side clutch levers 13L and 13R are provided below the rear ends of the left and right handle rods 12L and 12R. The right handlebar 12R is provided with an engine key switch 17, an accelerator lever 14 and a rotary clutch lever 15 for starting the engine. The left handlebar 12L is provided with a parking lever 39 and a handle up / down adjustment lever 18, and the left and right handlebar 12L. , 12R are connected to each other, a main clutch lever 16 for turning on and off the clutch of the belt transmission clutch mechanism is provided at the upper part, and an emergency stop lever 40 is provided at the lower part. When the main clutch lever 16 is moved forward, the clutch of the belt transmission clutch mechanism is turned on. When the emergency stop lever 40 is moved in the lowering direction, the main clutch lever 16 returns to the original position. 16 is operated to turn off the clutch of the belt transmission clutch mechanism.

  A shift lever 41 is provided in the middle of the left and right handle rods 12L, 12R so as to extend rearward from the mission case 1.

  3 and 4, the power transmission configuration from the engine E to the mission case 1 will be described. The rotational power of the crankshaft of the engine E is input to the speed reducer 33, and the rotational power decelerated by the speed reducer 33 is output from the output shaft 20a. A belt cover 19 covers the two transmission belts 32, 32 wound around the output pulley 20 attached to the output shaft 20 a and the input pulley 21 attached to the input shaft 21 a of the transmission case 1.

  A belt back cover 24 is provided on the body side of the two transmission belts 32, 32. The belt back cover 24 is provided between the speed reducer 33 and the transmission belt 32. Since there is a gap behind the speed reducer 33, the cover 23 is attached to the belt back cover 24 by welding to cover the gap from above. The belt back cover 24 and the cover 23 are attached to the side surface of the engine E and the side surface of the transmission case 1 with bolts. For this reason, the body side of the cover 23 is bent downward to form a bolt through hole.

  The upper mounting stay 22 integrated with the belt cover 19 is bent downward so as to be aligned with the line of the cover 23, and the upper mounting stay 22 is attached to the cover 23 with a bolt B1. The front side of the belt cover 19 is attached to the reduction gear 33 with bolts 19a, and the rear side of the belt cover 19 is attached to the transmission case 1 with bolts 19b.

  The upper mounting stay 22 is provided with an accelerator cable clamp, and an accelerator cable (not shown) is fastened by this clamp. Further, a clutch cable outer receptacle 34 is provided in the cover 23 so that the clutch cable 38 passes through the cover 23, and a hole and a notch are provided in the clutch cable outer receptacle 34. It is easy to hang on the support 34.

  Further, the tension arm 25a provided with the belt tension pulley 25 is provided so as to be positioned below the cover 23 from the rotation fulcrum 25b on the airframe side, and a hole for applying a tension spring 25c is provided on the tension arm 25a. Yes.

  FIG. 5 shows the mounting of the engine base 3 and the hitch bracket 8 to the transmission case 1. The engine base 3 is mounted with bolts 27 by aligning the left and right side wall cases, in which sheet metal is recessed by press molding, on the front side, in side view. A hitch bracket 8 welded to a hitch 4 bent backward in a U-shape is attached together with bolts 28 for fitting the left and right cases of the transmission case 1 together.

  Further, the reinforcing connecting member 5 in which the upper connecting plate 5a in contact with the outer side surface of the transmission case 1 and the rear connecting plate 5b in contact with the outer side surface of the hitch bracket 8 are welded together by the bolts 27 and 28. A lower reinforcing edge 5b2 is formed on the rear connecting plate 5b.

  Accordingly, the weight of the engine E, the driving reaction force, and the traction load of the work implement can be received by the reinforcing connecting material 5, so that the load applied to the transmission case 1 can be reduced, and the left and right side walls constituting the transmission case 1 It is possible to prevent a gap on the mating surfaces of the plates and damage to the left and right side wall plates themselves.

  In this embodiment, the reinforcing connecting member 5 composed of the upper connecting plate 5a and the rear connecting plate 5b is not welded to the hitch bracket 8, so that the hitch bracket 8 and the hitch 4 can be exchanged according to the working machine. It becomes easy to do.

  However, in the case of a dedicated work machine that does not replace the work machine, the reinforcing connecting member 5 may be welded to the hitch bracket 8.

  In this case, the strength is increased and the number of parts is reduced.

  As shown in FIG. 6, the A portion fastening portion of FIG. 5 is configured such that the left and right upper connecting plates 5 a are attached together by bolts and nuts 27 with the engine base 3 and the transmission case 1 sandwiched therebetween. W is a washer. Although the A1 portion fastening portion below the A portion fastening portion is not illustrated in FIG. 6, the transmission case 1 is sandwiched between the rear side walls of the engine base 3 and attached together by bolts and nuts 27.

  As shown in FIG. 7, in the B part fastening portion of FIG. 5, the transmission case 1 is sandwiched between the left and right side walls of the hitch bracket 8 and is fastened together with bolts and nuts 28. FIG. 7 also shows an E portion fastening portion and an F portion fastening portion. The F portion fastening portion fastens the rear connecting plate 5 b and the hitch bracket 8 with bolts and nuts 29.

  5, the left and right side walls of the transmission case 1 and the hitch bracket 8 are sandwiched between the left and right side walls of the rear connecting plate 5 b of the reinforcing connecting member 5 and are fastened together by bolts and nuts 28 as shown in FIG. 8. Yes. In the D part fastening portion of FIG. 5, as shown in FIG. 9, the lower connecting reinforcement 5b1 of the transmission case 1 and the rear connecting plate 5b of the reinforcing connecting member 5 are sandwiched between the left and right side walls of the rear connecting plate 5b and tightened together with bolts and nuts 28. It is attached by. Reference numeral 7 denotes a guard plate. In particular, in the lower part of the mission case 1, the joint surface 1a of the left and right side wall plates constituting the mission case 1 is protected and also serves as reinforcement of the mission case.

  In the E portion fastening portion of FIG. 5, as shown in FIG. 10, the side walls of the upper connecting plate 5 a and the rear connecting plate 5 b are overlapped with the side walls of the hitch bracket 8 and attached with bolts and nuts 29.

  As shown in FIG. 5, the upper connecting plate 5a is formed with an upper reinforcing edge 5a1 and a lower reinforcing edge 5a2 that are erected laterally. The upper reinforcing edge 5a1 extends to the front of the front mounting bolt 27 of the A portion fastening portion, and the lower reinforcing edge 5a2 extends to the rear end of the rear connecting plate 5b to make it resistant to lateral bending.

  The lower part of the rear connecting plate 5b extends downward from the hitch bracket 8 and a U-shaped lower connecting reinforcing plate 5b1 for welding the left and right rear connecting plates 5b is welded to the portion (FIG. 5).

  The holes through which the bolts 27 and 28 are passed are not elongated so that the left and right side wall plates of the mission case 1 are not displaced.

  FIG. 11 is a perspective view showing a state where the hitting roller 45 is mounted on the hitch 4 of the walking type working machine, and the operator sits on the seat 46 provided on the walking roller 45 and sits at the rear ends of the left and right handlebars 12L and 12R. The left and right grips 12La and 12Ra are provided to perform the steering operation. Reference numeral 47 is a foot brake for braking the rotation of the wheat tread roller 45.

E Engine 1 Transmission case 2L, 2R Left and right traveling wheels 3 Engine stand 4 Hitch 5 Reinforcement connection material 5b1 Lower connection reinforcement plate 6 Axle 7 Second reinforcement connection material 8 Hitch bracket 9 Rotary tillage device

Claims (3)

  The left and right traveling wheels (2L, 2L, 2) mounted on the axle (6) of the transmission case (1) by transmitting the power of the engine (E) mounted on the engine stand (3) provided at the front of the airframe to the transmission case (1) 2R), a walk-type work machine in which a work machine is mounted on a hitch bracket (8) provided at the rear part of the transmission case (1), and a reinforcing connection that connects the engine stand (3) and the hitch bracket (8) A walking type working machine, wherein the transmission case (1) is attached integrally to the transmission case (1) by sandwiching the transmission case (1) from left and right with a material (5).   The walking type work machine according to claim 1, wherein the engine stand (3), the hitch bracket (8), and the reinforcing connecting member (5) are attached to the transmission case (1) by fastening together. The walking work machine according to claim 1 or 2, further comprising a lower connection reinforcing plate (5b1) sandwiching the mission case (1) below the mission case (1).

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