JPH071722U - Power mower - Google Patents

Abstract

(57) [Summary] [Purpose] The whole structure can be made simple, small, lightweight, and inexpensive, and it is easy to handle and has high work efficiency.
In addition, maintenance work can be done easily, and each part can be rationally arranged without significantly affecting the prime mover, and the power can be efficiently distributed and transmitted. provide. [Structure] A cutting blade 37 which is rotationally driven by an output from a drive unit 20 including a power source provided at the tip of an operating rod 65, and a self-propelled drive wheel 53 which is driven by an output from the drive unit 20. And a power transmission means 46a interposed between the drive unit 20 and the drive wheel 53,
In the power mower provided with 46b and 47, the power transmission means 46a, 46b and 47 are configured to be able to switch the rotational drive direction of the drive wheel 53 to normal rotation, reverse rotation, or idle rotation. The operating rod 65 is connected to the drive wheel 53.
It is attached so as to be rotatable in the traveling direction of.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power mower, and more particularly to a self-propelled power mower equipped with a cutting blade driven by a power source.

[0002]

[Prior art]

 Generally, a type of power mower such as a shoulder type or a backpack type is used.In such a power mower, the handling is easy and the operability is good, but the weight of the entire machine during work is reduced. The operator had to support it, and the degree of physical fatigue was great, making it unsuitable for long-term work.

By the way, it is necessary to provide a cutting blade driven by an internal combustion engine and a self-propelled drive wheel that is driven by a motor so as to be able to rotate forward and backward, and whose traveling direction can be switched between forward and sideward. It is known that the machine body is moved in the front-rear direction or in the left-right direction in accordance with the above, so that the weeding work can be performed (see, for example, Japanese Patent Laid-Open No. 63-167714).

[0004]

[Problems to be solved by the device]

 However, in the conventional power mowers described above, a motor and an internal combustion engine are respectively provided as power sources for driving the drive wheels and the cutting blades, so that the structure is complicated and the weight is large, and the movement However, it is difficult to perform maintenance because it is difficult to maintain and it is expensive as a whole.

The present invention has been made in view of such problems of the conventional power mowers, and its object is, in particular, that the entire structure can be simple, small-sized, lightweight and inexpensive, and It is easy to handle, has high work efficiency, can perform maintenance work easily, and each part can be rationally arranged without having a great adverse effect on the prime mover, and power can be efficiently distributed and transmitted. To provide a power mower that has been adapted to do so.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the power mower according to the present invention basically comprises a cutting blade that is rotationally driven by an output from a drive unit including a power source provided at the tip of an operating rod, and the drive. A power lawn mower comprising: a self-propelled drive wheel driven by an output from a drive section; and a power transmission means interposed between the drive section and the drive wheel. Is characterized in that the rotational drive direction of the drive wheel can be switched between normal rotation, reverse rotation, and idle state, and the operating rod is mounted rotatably with respect to the traveling direction of the drive wheel. It is characterized by that.

[0007]

[Work]

 In the power mower according to the present invention configured as described above, the drive wheel can be switched between normal rotation, reverse rotation, and idle rotation (neutral), and both a self-propelled type and a hand-push type can be used and the drive can be performed. The handle attachment angle with respect to the traveling direction of the wheel is adjustable, so that the working traveling direction can be easily changed at any time.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the overall structure of a power mower according to the present invention. 2 is a plan view of the power mower shown in FIG. 1, FIG. 3 is a cross-sectional view of the main part of the III-III arrow of FIG. 2, and FIG. 4 is a schematic cross-sectional view of the III-III arrow of FIG. FIG.

The power mower 10 of the illustrated example is roughly classified into a drive unit 20 including a power source, a work unit 30 for performing a mowing work, and a power transmission unit for transmitting power from the drive unit 20 to the work unit 30. 40, a traveling unit 50 for moving the machine body, and an operation unit 60 for steering. The drive unit 20 includes an internal combustion engine (not shown) as a power source, which is fixedly arranged in an outer case 21 in which a transmission case 41 is vertically provided at a lower end portion thereof. As shown in FIGS. 3 and 4, the tip of the output shaft of this internal combustion engine is connected to a main shaft 42, and the main shaft 42 is pivotally supported by rolling bearings 43, 44, 45.

The power transmission unit 40 includes the main shaft 42, a cylindrical member 82 concentric with the main shaft 42 and externally fitted so as to be vertically slidable, and near the upper end and the lower end of the cylindrical member 82. An upper drive-side bevel pulley 46a and a lower drive-side bevel pulley 46b, which operate as a switching clutch fixed by welding or the like, and a drive-side bevel pulleys 46a and 46b above and below are vertically arranged so as to be sandwiched between them in the vertical direction. In addition, it is provided with a driven bevel pulley 47 which is selectively frictionally joined to the upper and lower driving bevel pulleys 46a and 46b. A facing material such as a sintered powder metal or a rubber material is attached to the friction joint surface of the driven bevel pulley 47. The upper and lower driving side bevel pulleys 46a and 46b and the driven side bevel pulley 47 constitute a power transmission means.

The driven bevel pulley 47 is coaxially fixed to an input shaft 49 having a small gear 48 fixed to the other end thereof, and the input shaft 49 is rotatably supported by rolling bearings 84 and 85. There is. A coil spring 94 for constantly urging the tubular member 82, that is, the upper and lower drive bevel pulleys 46a, 46b upward is mounted between the lower driven bevel pulley 46b and a drive sprocket 31 described later. Has been done. Further, a stopper member 86 for restricting the upward and downward movement range of the upper and lower drive side bevel pulleys 46a and 46b is vertically moved in the cylindrical member 82 in a vertically elongated through groove portion 87 formed in the main shaft 42. It is inserted in the diametrical direction.

On the other hand, an operating lever 80, which moves the upper and lower drive-side bevel pulleys 46 a and 46 b up and down to make a connection / disconnection operation with the driven-side bevel pulley 47, is attached to a handle 64, which will be described later, to operate right. The lever 69a and the left operation lever 69b are provided so that they can be linked and operated. The operating lever 80 is pivotally supported by a support shaft Q, and an operating member 88 that moves up and down in conjunction with the operating lever 80 is fixed to the operating lever 80 by a screw 93 or the like. Further, the actuating member 88 is, for example, through the thrust bearing 44 or the like, which is integrally fitted to the outer surface of the intermediate portion of the tubular member 82 and pushed down by the swinging tip of the actuating member 88. 82 is arranged so as to move up and down, so that the upper and lower drive side bevel pulleys 46a and 46b can be moved up and down together by the rotation of the operating lever 80 via the operating member 88. It has become.

The working portion 30 includes the drive sprocket 31 fixed to the lower end of the main shaft 42 (immediately above the rolling bearing 45) by the key 2 and a driven sprocket 31 that is chain-transmitted with the drive sprocket 31. 33 and a power take-out shaft 34 to which the driven sprocket 33 is fixed by the key 3, and the power take-out shaft 34 is vertically supported by rolling bearings 35 and 36. Further, an elongated plate-shaped cutting blade 37 is fixed to a small diameter portion 34a formed in the lower portion of the power take-out shaft 34, and the lower portion of the power take-out shaft 34 is attached to the lower end portion from below. A spherical bowl-shaped cover 38 for encapsulation is fixed.

As can be seen from FIGS. 3 and 4, the main shaft 42, the upper and lower drive-side bevel pulleys 46 a and 46 b, the driven-side bevel pulley 47, and the upper half portion of the power take-off shaft 34 are the transmission case. A cutting blade cover 70 having a cylindrical lid shape is fixed to the lower end portion of the transmission case 41 by an appropriate method. The cutting blade 37 and the spherical bowl-shaped cover 38 are housed inside the cutting blade cover 70 (on the lower side). Further, the cutting blade cover 70 is provided with a discharge port 72 on the front side surface for discharging cut grass and the like.

The running portion 50 has a large gear 51 meshing with the small gear 48 fixed to the outer end of the input shaft 49, an output shaft 52 having the large gear 51 fixed by a key 4, and an output shaft 52. An inscribed small gear 54 that is fixed to the outer end of the output shaft 52 and drives the drive wheel 53 to rotate. The drive wheel 53 as a whole forms an internal gear in which internal teeth 58 meshing with the internal small gear 54 are formed on the inner peripheral surface of a rim 96. On the other hand, the axle 57, the inner end of which is fixedly mounted in the transmission case 41 and extended outward, is laterally fitted and inserted to the vicinity of the outer side surface of the drive wheel 53, so that the drive wheel 53 is driven. It is pivotally supported by rolling bearings 55 and 56 provided in the center of the rim 96.

Further, first and second auxiliary wheels 59 are provided on the rear side and the front side of the drive unit 20 opposite to the drive wheel 53 with respect to the operation rod 65 via support rods 75a and 75b. a and 59b are attached in parallel with the drive wheel 53 (see FIGS. 1 and 2). As shown in FIG. 1, the operation portion 60 includes a cylindrical L-shaped support rod 63 protruding rearward from a rear end portion of the transmission case 41 via a bracket 62, and a U-shaped support rod 63 at an upper end portion thereof. It is possible to change the mounting angle of the tubular operating rod 65 having the character-shaped handle 64 fixed thereto and the operating rod 65 with respect to the support rod 63 three-dimensionally (rotatably on the horizontal plane and the vertical plane). And a handle joint 66 for connection. The handle joint 66 includes a joint member 68 including a fixed side (lower side) connecting portion 68a and a rotating side (upper side) connecting portion 68b each having a chrysanthemum seat serving as a rotation restricting member on each joint surface. And a lever 67 capable of three-dimensionally changing / fixing the mounting angle of the operating rod 65 (the handle 64) at a time.

Further, the handle 64 is provided with a right operation lever 69 a and a left operation lever 69 b for switching between forward and backward (left and right) forward movements, which are linked to the operation lever 80 via a wire 90. Next, the operation of the power mower according to the embodiment of the present invention constructed as described above will be described.

First, the operation of the system for operating the working unit 30 from the drive unit 20 via the power transmission unit 40 will be described. In this system, the main shaft 42 is rotationally driven by the output from the internal combustion engine, and this rotational force causes the driven sprocket 33 to drive the chain through the drive sprocket 31, and this driving force is further transmitted. And finally the cutting blade 37 is rotated. The weeds and the like cut by the cutting blade 37 are discharged from the discharge port 72 of the cutting blade cover 70.

Further, the spherical bowl-shaped cover 38 provided below the cutting blade 37 holds the cutting blade 38 so as to be substantially parallel to the ground, and rotates integrally with the power take-off shaft 34. The spherical bowl-shaped cover 38 that is in contact with the ground lightly functions as a third auxiliary wheel, which allows smooth progress to be obtained. Therefore, even when the power mower of the present invention is used for cutting grass, it is possible to perform cutting work without damaging the surface of the grass.

Next, the operation of the system from the drive unit 20 to the traveling unit 50 via the power transmission unit 40 will be described mainly with reference to FIGS. In this system, the operation lever 80 is operated via an appropriate interlocking mechanism by operating the right operation lever 69a or the left operation lever 69b provided on the handle 64, and the upper and lower drive side bevel pulleys 46a are operated. 46b slides upward or downward to be selectively connected to the driven bevel pulley 47 or in a neutral (idling) position. In FIG. 3, the operating lever 80 has an F position indicated by a solid line (the drive wheel 53 is forward rotation, that is, forward or rightward movement), an R position indicated by a two-dot chain line (reverse rotation, backward movement or leftward movement), and an intermediate position thereof. N positions (neutral or idle) are selected. That is, the normal rotation or the reverse rotation is switched depending on whether the left or right operation levers 69a and 69b are grasped or released, and both the operation levers 69a and 69b are released to be neutral. To be in a state.

In this way, the operating member 88 also moves up and down in association with the rotation of the operating lever 80, and accordingly, the upper and lower drive-side bevel pulleys 46 a fixedly mounted on the tubular member 82. 46b also moves up and down. In FIG. 3, with the center line O-O of the main shaft 42 as the axis of symmetry, the right half portion thereof is shown in a state corresponding to the F position of the operating lever 80, while the left half portion is the operating lever 80. The state corresponding to the R position of is shown. That is, when the right operation lever 69a is gripped, the operating lever 80 is moved to the F position shown by the solid line in FIG. 3, and the lower drive-side bevel pulley 46b is brought into pressure contact with the driven-side bevel pulley 47 (of the main shaft 42). See the right half). Therefore, the rotational driving force from the internal combustion engine is transmitted to the input shaft 49 through the lower driving bevel pulley 46b and the driven bevel pulley 47, and further through the small gear 51 and the output shaft 52. Is transmitted to the inscribed small gear 54, and finally the drive wheel 53 is normally rotated to advance the machine body.

On the contrary, when the left operation lever 69b is gripped, the operating lever 80 becomes the R position in FIG. 3, and the upper driving side bevel pulley 46a is brought into pressure contact with the driven side bevel pulley 47 (the main shaft). (See left half of 42). Therefore, the rotational driving force from the internal combustion engine is transmitted to the input shaft 49 as a rotational force in the opposite direction to the above-mentioned case, and thereafter, this reverse rotational force is the same as that in the drive wheel 53. Then, the drive wheels 53 are reversely rotated, and the machine body is moved backward.

Next, when the left and right operation levers 69a and 69b are both released, the operating lever 80 is in the N position, and the upper and lower drive side bevel pulleys 46a and 46b are both disconnected from the driven side bevel pulley 47. It Therefore, the rotational driving force from the internal combustion engine is not transmitted to the drive wheels 53, and the movement of the power mower 10 is stopped. Then, in this state, it can be used by pushing or pulling it by hand as a hand-operated mower, if necessary. In this case, if the output shaft 52 is provided with a clutch (not shown) exclusively for manual operation, the resistance due to the power transmission system can be reduced, which is more preferable.

In the above operation state, the stopper member 86 slides in the groove 87 in the vertical direction to regulate the moving range of the upper and lower drive-side bevel pulleys 46a and 46b, and the main shaft 42 The rotation of the tubular member 82 is prevented (rotation stop). As described above, the power mower 10 of this illustrated example is voluntarily, forwardly or backwardly moved, or stopped (neutral) by a simple operation of the right operation lever 69a and the left operation lever 69b that the operator has at hand. It is possible. Further, as will be apparent from the above description, the power transmission means including the upper and lower driving side bevel pulleys 46a and 46b and the driven side bevel pulley 47 has functions such as clutch, speed change, and deceleration. is doing.

Next, the operation of the operation unit 60 will be described with reference to FIGS. When the right or left operating lever 69a or 69b is operated at the position of the handle 64 shown by the chain double-dashed line in FIG. 2, the upper or lower drive side bevel pulley 46a or 46b is driven by the operating lever 80. The side bevel pulley 47 is connected, the above-mentioned drive wheel 53 is driven in forward or reverse rotation, and the power mower 10 moves forward or backward while performing a mowing operation (left and right direction in FIG. 2).

Further, as shown by the solid line in FIG. 2, by operating (releasing and tightening) the lever 67, the operating rod 65 for the joint member 68, that is, the handle for the drive wheel 53, in plan view. The mounting angle of 64 can be changed and fixed. Therefore, as will be described later, it is possible to freely change the traveling direction viewed from the operator. For example, as shown by the solid line in FIG. 2, when the handle 64 is rotated 90 ° to the right with respect to the traveling direction of the body (right in FIG. 2), the operator is By operating the left and right operation levers 69a and 69b, it is possible to easily change the direction of the machine body to the right direction or the left direction freely. The same operation feeling is obtained and the mowing work can be performed more easily. Therefore, not only is the operability and work efficiency improved, but the effectiveness is also demonstrated in work such as lawn mowing, and a wide range of mowing work is possible.

Further, the handle 64 can freely change its mounting angle within the vertical plane, and can be adapted to the height and working posture of the worker. Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above-mentioned embodiment, and various embodiments are possible without departing from the present invention described in the scope of claims for utility model registration. Design changes can be made.

For example, the power mower of the present invention can be widely used by adapting to working conditions by changing the number of auxiliary wheels and drive wheels and their arrangement. Further, in the illustrated example, the rotational force transmitted from the internal combustion engine to the main shaft 42 is adapted to drive the driven sprocket 33 to drive the chain through the drive sprocket 31, but the power is transmitted by the belt drive by the pulley. Of course, you can do so. Further, in addition to the configuration of the illustrated example, it is also effective to attach a multi-stage transmission mechanism.

[0029]

[Effect of device]

 As can be understood from the above description, according to the present invention, the steering direction can be easily changed / adjusted, mowing over a wide range of terrain is possible, and the entire structure is inexpensive. In addition to being compact, lightweight, and easy to handle, it enables swift and highly efficient mowing work.

[Brief description of drawings]

FIG. 1 is a perspective view showing the overall configuration of a power mower according to an embodiment of the present invention.

FIG. 2 is a plan view of the power mower shown in FIG.

FIG. 3 is a cross-sectional view of a main part of a portion taken along the line III-III in FIG.

FIG. 4 is a schematic view of a partial cross section taken along the line III-III of FIG.

[Explanation of symbols]

 20 Drive Unit 37 Cutting Blade 46a Power Transmission Means (Upper Drive Side Bevel Pulley) 46b Power Transmission Means (Lower Drive Side Bevel Pulley) 47 Power Transmission Means (Driven Bevel Pulley) 53 Drive Wheel 65 Operation Rod

Claims (2)

[Scope of utility model registration request] 1. A cutting blade 37 that is rotationally driven by an output from a drive unit 20 including a power source provided at the tip of an operating rod 65, and a self-propelled drive that is driven by an output from the drive unit 20. Wheels 53 and power transmission means 46 interposed between the drive unit 20 and the drive wheels 53.
a, 46b, 47, wherein the power transmission means 46a, 46b, 47 can switch the rotational drive direction of the drive wheel 53 to a forward rotation, a reverse rotation, or a free rotation state. A power mower characterized by. 2. The power mower according to claim 1, wherein the operating rod 65 is rotatably attached to the traveling direction of the drive wheel 53.