JPH0521620U - Lawn mower - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] Effectively utilizing the wind generated in the main body case by the rotational force of the cooling fan, the cut grass is sent to the grass discharge port at the rear of the machine to collect the attached grass. Collect in the grass catcher. [Structure] A prime mover 3 having a cooling fan 2 on the upper end of a rotating main shaft 2a is installed on the upper part, a cutting blade 4 rotating horizontally with the prime mover 3 as a power source is installed on the lower part, and a lawn for cutting grass is provided on the rear part. The air from the cooling fan 2 is blown by the combination of the main body cover 5 and the main body cover 5 that covers the upper side of the main body 1 including the prime mover 3 and the main body 1 that has the turf discharge port 6 that discharges the air. Spiral channel 7 that guides and guides to the upper front side of
The flow path configuration case that constitutes the
The portion covering the prime mover 3 is bulged to form a spherical shape in which the lower circumferential edge 26 is closely superposed on the circumferential overlapping edge 25 of the flow path forming portion, and the groove end position of the flow path forming portion is formed. From aircraft 2
That is, an outlet 31 facing the direction of the lawn discharge port 6 is provided at a position in front of the cutting blade 4 below the machine body 1 through which

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lawnmower powered by a prime mover such as an electric motor and an engine. It relates to a lawnmower for mowing lawn.

[0002]

[Prior art and its problems]

 Conventionally, this type of lawn mower has, as shown in FIG. 11, a blower casing 38 in which a blower fan 37 driven by a prime mover 3 installed above the fuselage 1 as a power source is rotatably housed in front of the top of the fuselage 1. Install the blower casing 38 so that the air outlet 39 of the blower casing 38 faces the cutting blade 40 at the lower part of the machine body 1 through which the machine body 1 is passed, toward the lawn discharge port 41 at the rear of the machine body 1, and The grass cut by the blade 40 was sent from the grass outlet 41 at the rear of the machine 1 to the attached grass catcher without being scattered around by the force of the wind blown from the outlet 39. By the way, a fairly strong wind flow is required to send the cut grass to the grass outlet at the rear of the fuselage.Therefore, in order to obtain the strong wind, a large blower fan was installed at the top of the fuselage as a prime mover. It was installed by connecting them. Therefore, in the past, it was necessary to secure a space for installing a blower fan, so measures such as making the airframe and body case large were made, but the structure for that was complicated, and this type of In lawn mowers, a cooling fan that takes in outside air into the main body case is provided on the rotating main shaft of the prime mover in order to prevent overheating of the prime mover. Therefore, in the past, in addition to the rotary power to the cutting blade and cooling fan, a blower fan was used. In addition, since a prime mover with a power output capable of transmitting the rotational power, i.e., a large-sized and heavy-weight prime mover is installed on the upper part of the fuselage, conventional lawnmowers are large and heavy, and therefore their handling is inconvenient. However, there were drawbacks such as high cost and poor practicality.

[0003]

[Problems to be Solved by the Invention] The present invention has been made in view of such conventional circumstances, and the technical problem to be solved is to solve the problem of the outside air taken into the main body case by the cooling fan of the prime mover. By effectively using the wind generated in the main body case by the flow, that is, the rotating force of the cooling fan, the grass mowed by the cutting blade is sent to the grass discharge port at the rear of the machine without impeding the cooling effect of the prime mover. The purpose is to provide an improved lawn mower that can be collected in a grass catcher.

[0004]

[Means for achieving the object]

 The technical means taken by the present invention to achieve the above object is to install a prime mover equipped with a cooling fan at the upper end of a rotary spindle on the upper part and a cutting blade that rotates horizontally with the prime mover as a power source on the lower part. In addition, the wind from the cooling fan is blown by the combination of the main body cover that covers the upper side of the main body including the prime mover and the main body that has a grass outlet for discharging cut grass at the rear. A flow path forming case which constitutes a spiral flow path for guiding and guiding the upper part of the inside of the flow path forming case is internally installed, and a cylindrical portion of an upper and lower opening that covers the flow path forming case around the prime mover and an integrally provided around the cylinder portion are provided. From the upper side of the outer peripheral surface of the cylinder to the lower side from the upper side of the fuselage to the lower side, the circumferential overlap edge is identical to the outer peripheral edge of the groove with a desired groove width that gradually inclines in the same direction as the rotation direction of the cooling fan. Flow path component with a flat surface On the other hand, the portion of the main body cover that covers the prime mover is bulged to form a spherical shape in which the lower end edge of the circumference closely overlaps the circumferential overlapping edge of the flow path forming part, and A blowout opening facing the direction of the lawn discharge opening is provided at the cutting blade forward position in the lower portion of the machine body that penetrates the machine body from the groove end portion position of the component.

[0005]

[Action]

 According to the above-mentioned technical means of the present invention, the outside air taken into the main body case by the cooling fan of the prime mover is introduced into the main body case through the lower opening portion of the flow path forming case. While coming into contact with the prime mover, it rises in the cylinder and is introduced from the upper opening of the cylinder into the spiral flow path formed around the cylinder by the flow path forming section of the flow path forming case and the spherical section of the main body cover. A stronger wind is generated by the rotation of the cooling fan that rotates in the spiral direction of the spiral flow path, and while passing through the spiral flow path, it penetrates through the fuselage from the groove end portion of the flow path located on the front side of the upper part of the fuselage It is guided to an outlet installed in front of the cutting blade and blows out from the outlet toward the cutting blade and the grass outlet at the rear of the machine.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In the lawn mower, a prime mover 3 such as an electric motor or an engine having a cooling fan 2 at the upper end of a rotating main shaft 2a is installed on the upper part of the body 1, A cutting blade 4 that rotates horizontally using the prime mover 3 as a power source is installed in the lower part, the upper side of the machine body 1 including the prime mover 3 is covered with a main body cover 5, and grass cutting is discharged to the rear part of the machine body 1. A spiral flow that opens the turf discharge port 6 and further guides the wind from the cooling fan 2 to the upper front side of the machine body 1 by combining with the body cover 5 between the machine body 1 and the body case 5. The flow path forming case 8 that constitutes the path 7 is installed internally, and the flow of the outside air taken into the main body case 5 by the cooling fan 2, that is, the wind generated in the main body case 5 by the rotational force of the cooling fan 2 is used. Then cut with the cutting blade 4 Constituting the taken grass as to leave the feed to 該刈 blades 4 and the fuselage 1 rear turf outlet 6 side.

The airframe 1 is integrally molded into a shape of a substantially square shape in which the front portion is curved in a substantially semicircular shape in a plane and the lower side is opened to open the bottom portion and the rear portion. In the central portion of the upper wall 1a, a prime mover 3, and in the illustrated embodiment, an installation port 9 to be installed with the lower side of the electric motor dropped is provided, and the prime mover 3 is installed at an appropriate position on the edge of the installation port 9. The boss 11 for mounting the installation base 10 is made to project downward, and the screw 3 of the installation base 10 is fixed to the boss 11 to install the prime mover 3 on the upper part of the machine body 1 and the rotary spindle 1a of the prime mover 1. The cutting blade 4 is attached to and supported at the lower end via the transmission mechanism 13, and the cutting blade 4 is installed in the lower part of the machine body 1. Then, a mounting wall portion 15 to which the operation handle 14 is attached is provided upright in the rear center of the upper wall 1a, and traveling wheels 16 are attached to both front and rear portions.

By the way, as shown in FIGS. 9 and 10, the operation handle 14 of the lawn mower of the present embodiment has an upper pin 18 with a lower pin 17 as a vertical rotation fulcrum between mounting wall portions 15 at the rear of the machine body 1. The lower end is inserted into the connector 19 equipped to regulate the vertical rotation range, and the connecting cap 20 provided on the lower end side is detachably attached by screwing the connector 19 into the connector 19, and the operation handle 14 is further divided into two parts. Then, after inserting the other rod 14b into the connecting portion 21 provided on the one rod 14a and inserting the half-divided connecting body 21 between the two rods 14a and 14b, the two rods 14a and 14b are connected to each other. I am doing it. The half-divided connector 22 is integrally molded of synthetic resin (including FRP, etc.), and the split claw 22a is integrally provided with a latching claw 22a for fitting and latching each other, and the half-connecting body 22 is joined by a one-touch operation such as fitting. The rods 14a and 14b are formed so that they can be mounted over the outer sides of the rods 14a and 14b, and inside of the rods 14a and 14b, metal through-pins 24 for inserting and locking the rods 14a and 14b and the communication holes 23 formed in the connecting portion 21 are inserted. As shown in the figure, each is provided.

The main body cover 5 has a size that covers the entire upper portion of the machine body 1 including the prime mover 3 and the flow path forming case 8 by opening the bottom portion thereof, and is integrally formed into a shape having a substantially rectangular planar shape like the machine body 1. It is molded and has a spherical shape (dome shape) in which the central portion covering the prime mover 3 and the flow path forming case 8 overlaps with the circumferential overlapping edge 25 of the flow path forming case 8 to be described later with the lower circumferential edge 26. The shape) is swollen. When the main body cover 5 is attached to the upper part of the machine body 1, the bottom opening edge thereof is positioned so as to float from the machine body 1 so as to secure a certain gap as is conventionally known. That is, the outside air intake 27 is secured between the bottom opening edge of the main body cover 5 and the outer peripheral edge of the upper wall 1a of the machine body 1.

The flow path forming case 8 is a spiral that guides the wind generated by the cooling fan 2 of the prime mover 3 to the front position of the cutting blade 4 below the machine body 1 by being combined with the spherical surface portion 5a of the main body cover 5 to overlap. The flow path 7 is composed of a cylindrical portion 8a having upper and lower openings that surround the periphery of the prime mover 3, and a cylindrical portion 8a integrally provided around the cylindrical portion 8a. To the lower side of the cooling fan 2, the circumferential lower end edge 26 of the spherical portion 5a of the main body cover 5 is closely contacted to the outer peripheral edge of the groove with a desired groove width which is gradually inclined in the same direction as the rotation direction of the cooling fan 2. The flow path forming portion 8b is provided with the circumferential overlapping edge 25 to be overlapped with each other in the same plane.

The tubular portion 8a is formed to have a height corresponding to the entire height of the prime mover 3 with an inner diameter that covers the periphery of the prime mover 3 at a desired interval, and is installed at a proper position on the outer peripheral surface on the lower opening side thereof. A boss 29 for fixing the screw 28 to the base 10 is integrally provided, and the cylinder wall located between the bosses 29 is cut out from the lower opening edge side so that the outside air taken into the main body case 5 from the surrounding outside air intake 27 is inserted into the cylinder portion 8a. The inflow port 30 flowing into the inside is opened at a height along the spiral of the flow path forming portion 8b.

The flow path forming portion 8b is integrally provided around the cylindrical portion 8a so as to gradually incline in a spiral shape in the same direction as the rotation direction of the cooling fan 2, and from the outer peripheral surface of the cylindrical portion 8a. The groove width located on the circumferential lower edge 26 of the spherical surface portion 5a of the body cover 5 is the same as the circumferential lower edge 26, and the upper surface of the outer peripheral surface of the cylindrical portion 8a at the same plane level height as the front side of the fuselage 1 While gradually inclining in a spiral shape toward the lower side toward the wall 1a, a circumferential overlapping edge 25 is formed in the same plane as the outer peripheral edge of the groove at a height reaching the lower end edge 26 of the circumference. An outlet 31 facing the rear turf discharge port 6 is installed at a position in front of the cutting blade 4 at the lower part of the machine body 1 which penetrates the upper wall 1a of the machine body 1 from the groove end position of the flow path forming portion 8b. To do.

The outlet 31 is provided on the rear surface of the upper wall 1a in front of the cutting blade 4 at the lower part of the machine body 1 where the groove end of the flow path forming part 8b is located, and in the direction of the lawn discharge port 6 at the rear part of the machine body 6 The projecting walls 29 on both sides and the projecting walls 32 on both sides provided at the groove width intervals on the upper wall 1a of the airframe 1 from the groove end position of the flow path forming portion 8b, respectively. The spiral flow passage 7 is connected to the spiral flow passage 7 through the connection flow passage 34 that is formed by the hanging walls 33 on both sides of the main body cover 5 that are suspended at the inner side of the cooling fan 2. As a result, the wind guided from the groove end portion of the flow passage 7 through the connecting flow passage 34 while forcibly passing through the spiral flow passage 7 to the cutting blade 4 and the grass outlet 5 at the rear of the machine body 1. It blows out toward you.

Therefore, according to the lawnmower of the present embodiment configured as described above, the outside air taken into the main body case 5 from the ambient outside air intake 27 by the rotation of the cooling fan 2 of the prime mover 3 flows into the flow path. The casing 8 is introduced into the tubular portion 8a from the lower portion of the tubular portion 8a and ascends in the cylinder while coming into contact with the prime mover 3 from the upper opening 35 of the tubular portion 8a to the flow path forming portion 8b and the main body. It is introduced into the spiral flow passage 7 formed around the cylindrical portion 8a by the spherical surface portion 5a of the cover 5, and the groove of the flow passage 7 is passed through the spiral flow passage 7 by the rotation of the cooling fan 2 as a strong wind. It is guided from the terminal end through the communication flow path 34 to the outlet 31 installed in front of the cutting blade 4 at the bottom of the machine body 1 and from the outlet 31 to the lawn discharge port 6 at the cutting blade 4 and the rear portion of the machine body 1. It is blown toward (see FIGS. 7 and 8). Therefore, the lawn mowed by the cutting blade 4 is sent to the lawn discharge port 6 at the rear of the machine body 1 by the force of the wind blown from the blow-out port 31 and is not scattered to the surroundings. Collected in the attached accessory grass catcher 36.

[0015]

[Effect of the device]

 Since the lawnmower of the present invention is constructed as described above, it has the following operational effects. The outside air taken into the main body case by the cooling fan of the prime mover is introduced into the tubular part lower opening of the flow path forming case and rises in the cylinder while contacting the prime mover from the upper opening of the tubular part. A strong wind is generated by the rotation of the cooling fan that is introduced into the spiral flow passage formed around the cylindrical portion by the flow passage forming portion of the flow passage forming case and the spherical surface portion of the main body cover and that rotates in the spiral direction of the spiral flow passage. While passing through the spiral flow path, it is guided from the groove end part of the flow path located on the front side of the upper part of the machine body through the machine body to the outlet installed in front of the cutting blade at the lower part of the machine body and from the discharge port. Blow toward the grass outlet on the cutting blade and the rear of the machine.

Therefore, according to the lawnmower of the present invention, the flow of outside air taken into the main body case by the cooling fan of the prime mover, that is, the wind generated in the main body case by the rotational force of the cooling fan is effectively used, Since grass that has been mowed by the cutting blade can be sent to the grass discharge port at the rear of the machine and collected in the attached grass catcher without hindering the cooling effect of the prime mover, it can be used for collecting grass like a conventional lawn mower. It is not necessary to install a blower fan, and at the same time, the prime mover only needs to output rotational power to the cutting blade and the cooling fan, so the structure is greatly simplified, the size and weight can be reduced, and the cost is reduced. Becomes

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an example of an embodiment of the lawnmower of the present invention.

FIG. 2 is a plan view showing a notch of a main body cover.

3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a perspective view showing a main body cover.

FIG. 6 is a perspective view showing a state in which a main body cover is removed.

FIG. 7 is a partially cutaway side view showing the flow of wind.

FIG. 8 is a plan view of the same.

FIG. 9 is an exploded perspective view showing an operation handle.

FIG. 10 is a cross-sectional view showing a connected state of both rods of the operation handle.

FIG. 11 is a vertical sectional side view showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Machine body 2 ... Cooling fan 2a ... Rotating main spindle 3 ... Motor 4 ... Cutting blade 5 ... Main body cover 5a ... Spherical part 6 ... Grass outlet 7 ... Spiral flow path 8 ... Spiral flow path configuration case 8a ... Cylindrical part 8b ... Flow Road component 13 ... Transmission mechanism 25 ... Circumferential overlapping edge 26 ... Circumferential lower edge 30 ... Outlet

Claims (1)

[Scope of utility model registration request] 1. A prime mover equipped with a cooling fan at the upper end of a rotary spindle is installed on the upper part of the machine body, and a cutting blade that horizontally rotates with the prime mover as a power source is installed on the lower part of the machine body, and the prime mover is included. In a lawn mower in which the upper side of the machine body is covered with a main body cover, and a lawn discharge port for discharging the lawn is opened at the rear of the machine body, a combination of the main body cover and the main body cover is provided between the machine body and the main body cover. By means of which a flow path forming case that constitutes a spiral flow path for guiding the wind from the cooling fan to the front side of the upper part of the machine body is internally installed, and a cylinder part having upper and lower openings covering the flow path forming case around the prime mover, and this cylinder. A groove having a desired groove width that is integrally provided around the portion and gradually inclines in the same direction as the rotation direction of the cooling fan from the upper side of the outer peripheral surface of the tubular portion to the lower side from the upper front side of the machine body. Equipped with a circumferential overlapping edge on the outer periphery in the same plane A flow path forming part, and a part that covers the prime mover of the main body cover is formed to bulge into a spherical shape in which the circumferential lower end edge closely overlaps on the circumferential overlapping edge of the flow path forming part, And at the cutting blade front position of the lower part of the machine body that penetrates the machine body from the groove end position of the flow path forming part,
A lawn mower, which is provided with an outlet facing the direction of the lawn discharge port.