JP3420453B2 - Walking cultivator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine having a power take-off shaft projecting downward, a claw rotor disposed below the engine, the power take-off shaft and A power transmission mechanism between the claw rotors built in a transmission case, and a power transmission unit disposed below the engine; and a handle extending upward and rearward on the rear side of the tillage unit; The present invention relates to a walking type cultivator to which a resistance rod extending downward and downward below a handle is connected. 2. Description of the Related Art Conventionally, such a walking type cultivator is well known, for example, from Japanese Patent Application Laid-Open No. 7-26979. [0003] However, in the above-mentioned conventional device, a bracket and a frame are provided between the engine body and the transmission case, and a handle and a resistance bar are attached to the bracket. For this reason, the number of parts becomes relatively large, and the assembling work becomes complicated, and a problem occurs in the strength of the joint between the frame and the bracket and the engine and the transmission case, and it is necessary to increase the strength of the joint. The present invention has been made in view of the above circumstances, and has been made possible by connecting the handle and the resistance rod to a tilling unit while minimizing the number of parts and facilitating assembly work. It is an object of the present invention to provide a walking cultivator capable of sufficiently increasing the connection strength between the cultivators. [0005] In order to achieve the above object, the present invention provides an engine having a power take-off shaft projecting downward, a pawl rotor disposed below the engine, A power transmission mechanism between the take-out shaft and the pawl rotor is built in a transmission case, and a power transmission unit disposed below the engine; And a walking cultivator to which a resistance rod extending downward and downward below the handle is connected, wherein a member integrated with the engine body of the engine is provided with an upper end of a transmission case.
The direct bond, to a single <br/> bracket is integral with the transmission case, the left, a semicircular cross section that opens to the right both sides
A pair of left and right pipe supports, and both pie
Has an insertion hole through which the upper end of the resistance bar can be inserted
A resistance rod support to which the upper end of the resistance rod can be fixedly attached.
A holding part is provided integrally with the pair of left and right pipe supporting parts,
Front ends of a pair of left and right pipes that constitute the front part of the handle
Approximately half the circumference of each part is fitted, and both pipes
A pair of right and left holding parts on the outer circumference of both pipes on the opposite side of the support
The two pipes forward.
The bracket is attached to the bracket . According to such a configuration, the upper end of the transmission case integrally including the handle and the bracket to which the resistance bar is attached is directly connected to the member integral with the engine body, so that the transmission between the engine body and the transmission case is possible. This eliminates the need for frames and brackets that were required in the past, reducing the number of parts and facilitating assembly work. Also, since the number of parts is reduced, the connection strength between the engine body and the transmission case is sufficiently increased. Can be increased. An embodiment of the present invention will be described below based on an embodiment of the present invention shown in the accompanying drawings. FIGS. 1 to 7 show an embodiment of the present invention. FIG. 1 is a side view of a walking-type cultivator, FIG. 2 is a plan view of a walking-type cultivator, and FIG. 4 is a vertical sectional view of the lower part of the tilling unit, FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG. 4, FIG. 6 is a sectional view taken along line 6-6 of FIG. 5, and FIG. It is a 7-line enlarged sectional view. Referring first to FIGS. 1 and 2, a walking-type cultivator T includes an engine E, a tilling unit 11 disposed below the engine E, and a power transmission for transmitting the power of the engine E to the tilling unit 11. A rearwardly extending handle 14 and a handle 1
4 and a resistance bar 15 extending downward and downward. Referring to FIG. 3, an engine E is a vertical type four-stroke air-cooled engine, and has an engine body 18 having a cylinder block 16 with an integrated head and a crankcase 17 joined to the cylinder block 16.
The engine body 18 is provided with a crankcase 17.
Are arranged on the rear side of the cylinder block 16 and are arranged in the front-rear direction. A piston 20 is slidably fitted in a cylinder bore 19 provided in the cylinder block 16, and a crankshaft 22 connected to the piston 20 via a connecting rod 21 has a rotation axis extending vertically. And is rotatably supported by the crankcase 17. A head cover 23 forming a valve chamber 24 between the cylinder block 16 and the front end of the cylinder block 16 is connected to the cylinder block 16. The valve operating chamber 24 is formed so as to extend from the lower portion of the cylinder block 16 to the front end thereof, and reduces the rotational power of the crankshaft 22 to 1/2 to reduce the opening and closing power of intake and exhaust valves (not shown). A valve train 25 for conversion is housed in the valve train chamber 24. An oil reservoir 26 is formed at an upper portion of the crankcase 17. An oil slinger 27 for stirring oil stored in the oil reservoir 26 to form an oil mist is provided on the crankshaft 22. Connected to the oil reservoir 2
6 is stored. At the lower end of the crankshaft 22, a cooling blade 2 is provided.
9 is fixed, and the rotor 3
The ignition coil 31 which constitutes the flywheel magneto 28 in cooperation with 0 is fixed to the lower side of the cylinder block 16. An engine cover 32 that covers the engine body 18 together with its head and flywheel magnet 28 is integrally connected to the engine body 18.
A recoil starter 33 connected to the upper end of the engine cover 32 is mounted.
Is provided with an insertion hole 35 for inserting the. As is clearly shown in FIG.
An exhaust muffler 36 is disposed on the right side of the engine body 18 along the forward direction of the engine so as to be covered with the engine cover 32.
6a is disposed on the right side of the engine body 18 with the opposite side to the engine body 18, that is, facing outward. Further, an opening 37 for discharging exhaust gas discharged from the exhaust port 36a is provided on the right side of the engine cover 32. An air cleaner 38 is arranged on the left side of the engine body 18 along the forward direction of the tilling unit 13 so as to be located outside the engine cover 32. It is covered with a cover 39 which is a separate body. Further, a fuel tank 42 is disposed behind the engine body 18.
2 is fastened to the engine cover 32. Referring again to FIG. 3, an opening 43 is provided below the engine cover 32 at a position corresponding to a position below the crankshaft 22, and a centrifugal clutch 44 is disposed in the opening 43. The centrifugal clutch 44 includes a power take-off shaft 45 coaxial with the crankshaft 22 and protruding downward from the engine cover 32, and a flywheel magnet 28.
A plurality of clutch shoes 46 supported by the rotor 30 so as to be able to expand in diameter, a clutch drum 47 surrounding the clutch shoes 46 and fixed coaxially to the power take-off shaft 45, and reducing the clutch shoes 46 And a spring (not shown) for urging in the radial direction. When the crankshaft 22, that is, the rotor 30 rotates at a predetermined rotation speed or more, the clutch shoes 46 are pressed against the inner peripheral surface of the clutch drum 47. The rotational power of the crankshaft 22 is transmitted to the power output shaft 45. Referring to FIG. 4, FIG. 5 and FIG.
The tilling unit 11 includes a tilling shaft 50 extending in the left-right direction on the front side of the power take-out shaft 45, a pair of left and right inner claw rotors 51, 51 attached to the tilling shaft 50, and a pair of left and right outer claw rotors 52, 52. And disposed below the engine E. Each inner claw rotor 51, 51 has two tilling claws 51a, 51a bent inward on the tip side, and two tilling claws 51b, 51 bent outward on the tip side.
b, and each outer pawl rotor 52, 52
The four tilling claws 52 bent inward on the tip side
a ... are provided. The power transmission unit 12 has a power transmission mechanism 53 for transmitting the power of the power take-off shaft 45 projecting downward from the engine E to the inner and outer pawl rotors 51, 52,. It is built in the case 54. The transmission case 54 includes a shaft housing portion 55a formed in a cylindrical shape extending upward and downward, and a flat box-shaped gear housing portion 55b integrally connected to a lower end of the shaft housing portion 55a and having an open front side. Case body 55 including
And a lid member 56 for detachably closing the front opening end of the gear storage portion 55b. Moreover, the shaft housing 55
The upper end of the centrifugal clutch 44 is directly fastened to the engine cover 32 integrated with the engine body 18 so that a part of the centrifugal clutch 44 is housed in the upper end. The upper end is rotatably supported via a bearing 57. An axially intermediate portion of the tilling shaft 50 in the tilling portion 11 is rotatably penetrated through the gear housing 55b, and a pair of seal members 58, 58 and a pair of gears are provided between the gear housing 55b and the cultivating shaft 50. Bearings 59, 59 are provided. The power transmission mechanism 53 has a power take-out shaft 4 at the upper end.
5, a transmission shaft 61 rotatably housed in a shaft housing 55a, a cylindrical worm 62 provided below the transmission shaft 61, and a gear housing closed by a lid member 56. The worm wheel 63 is rotatably housed in the tilling unit 11 and is fixed to the tilling shaft 50 of the tilling unit 11. The cylindrical worm 62 and the worm wheel 63 are meshed with each other to form a worm gear. You. The upper end of the transmission shaft 61 and the shaft housing 55a
A seal member 64 is provided between the upper ends of the transmission shaft 61 and the shaft housing 55a above and below the cylindrical worm 62.
Bearings 65 and 66 are provided between them. Further, the shaft housing 55
The lower end of “a” is closed by a cap 57. Referring also to FIG. 7, a bracket 68 extending rearward along the forward direction of the tilling unit 13 is integrally provided at the upper end of the transmission case 54, that is, at the upper end of the shaft housing 55a. The handle 14 and the resistance bar 15 are attached to the bracket 68. The handle 14 is provided with a pair of left and right pipes 69, 69 extending rearward so as to increase the distance therebetween toward the rear side, and holding portions 71, 71 at the rear end. And a handle main portion 70 formed in a substantially U-shape. Both front ends of the handle main portion 14b can be inserted and removed from the rear side inside the rear ends of both pipes 69, 69. Fitting recesses 69a, 69 to be fitted
a is provided respectively. Thus, the fitting recesses 69a, 69
a on both sides of the front end of the handle main portion 14b fitted to the handle main portion 14a and the rear ends of both pipes 69, 69.
Screw members 72, 72 are respectively inserted from the b side, and nuts 73, 7 which are engaged with the outer ends of the rear ends of both pipes 69, 69.
The handle 3 is screwed into each of the screw members 72, 72, so that the handle main portion 70 is connected to the pipes 69, 69 to form the handle 14. At the rear of the bracket 68, a pair of pipe supports 7 having a semicircular cross section opened to both the left and right sides.
8 and 78 are integrally provided so as to be inclined upward and rearward, and approximately half the circumference of the front end of both pipes 69 and 69 in the handle 14 is fitted to both pipe support portions 78 and 78. Pressing members 79, 79 are in contact with the outer circumferences of the two pipes 69, 69 on the opposite side to the two pipe support portions 78, 78, and one of them is provided at two places spaced apart in the axial direction of the pipes 69, 69. The nuts 81 engaging with the other holding member 79 are screwed into bolts 80 penetrating from the holding member 79 to the other holding member 79, respectively.
4 is attached to the bracket 68. The bracket 68 is integrally provided with a cylindrical resistance rod support portion 83 having an insertion hole 82 inclined backward and downward between the two pipe support portions 78, 78. With the upper end of the rod 15 inserted, a nut 85 that engages the bolt 84 passing through the resistance bar support 83 and the resistance rod 15 from one side of the resistance rod support 83 to the other side of the resistance rod support 83. Is screwed, so that the resistance bar 15 is fixedly attached to the resistance bar support portion 83. Further, the resistance bar 15 is provided with a plurality of through-holes 86 through which the bolts 84 are passed, at a plurality of locations spaced apart in the longitudinal direction of the resistance bar 15.
By selectively selecting one of the...
The distance from 8 to the lower end of the resistance bar 15 can be changed. In this manner, the handle 14 and the resistance bar 15 are attached to the bracket 68 integrated with the transmission case 54. As shown in FIG.
4 is an extension line L of the handle 14 toward the front side.
₁ is set to pass near the rotation axis of the claw rotors 51, 52, that is, the axis of the tilling shaft 50. When the tilling unit 13 is viewed from the side, the handle 14 and the resistance bar 15 are connected to the rear portion of the tilling unit 13 in an arrangement that crosses substantially in an “X” shape below the engine E. made, but is set in a range center of gravity G of the walk-behind tiller T are defined above, the lower in extension L ₂ of the front side of the extension line L ₁ and the resistance bar 15 to the front side of the handle 14 Thus, the inclination angles of the handle 14 and the resistance bar 15 are set. In order to maintain high tilling performance, it is desirable that the center of gravity G is located between the rotation axis of the tilling unit 11, that is, the position immediately above the tilling shaft 50 and the two extended lines L ₁ and L ₂ . A guard plate 87 that covers the upper and rear sides of the tilling unit 11 is fixed to the bracket 68. The guard plate 87 is for preventing mud from splashing toward the operator during the tilling operation by the tilling unit 11, and is provided integrally with the guard plate 87, for example, at two locations in pairs. The parts 87a are bolts 88 and nuts 89.
Is fixed to the bracket 68. Next, the operation of this embodiment will be described. The exhaust muffler 36 has its exhaust port 36a directed to the opposite side of the engine body 18 so that the right side of the engine body 18 along the forward direction of the tilling unit 13 can be used. The exhaust gas from the exhaust muffler 36 is discharged toward the right outside of the engine body 18. Therefore, during the tilling work by the walking cultivator, it is possible to minimize the possibility that the exhaust gas is applied to the worker behind the engine E by gripping the handle 14 and the tilling work can be performed more smoothly. The air cleaner 38 is disposed on the side opposite to the exhaust muffler 36, that is, on the left side of the engine body 18 along the forward direction of the tilling unit 13, so that the air cleaner 38 minimizes the suction of exhaust gas. In addition, the life of the filter member in the air cleaner 38 can be extended by sucking the fresh air into the air cleaner 38, and the cultivation can be performed by disposing the exhaust muffler 36 and the air cleaner 38 on both the left and right sides of the engine body 18. This can contribute to equalization of the left and right weight balances in the machine T. The upper end of the transmission case 54 in the power transmission section 12 is directly connected to the engine cover 32 which is integral with the engine body 18, and another member is interposed between the engine body 18 and the transmission case 54. Is unnecessary, and mission case 5
Since the handle 14 and the resistance bar 15 are attached to the bracket 68 provided integrally with the upper end of the bracket 4, the number of parts can be reduced and the assembling work can be facilitated. Engine body 18
In addition, the connection strength between the transmission cases 54 can be sufficiently increased. Furthermore forward claw rotor 51 ... than the power takeoff shaft 45, 52 ... in addition to the rotation axis is located, the extension line L ₁ claw rotor 51 to the front side of the handle 14 ..., 52
The inclination angle of the handle 14 is determined so as to pass near the rotation axis of..., And the position of the center of gravity of the entire cultivator T is shifted upward and downward by extension lines L ₁ and L ₂ of the handle 14 and the resistance rod 15 to the front side. It is set within the specified range. For this reason,
The mounting portion of the handle 14 and the resistance rod 15 to the tilling unit 13 can be set at a position relatively close to the center of gravity G, and the handle 14 and the resistance rod 15 during tilling work can be set.
Vibration can be suppressed as much as possible. Moreover, the handle 14 and the resistance bar 15
The tilling unit 13 is connected to the bracket 68 of the tilling unit 13 in a substantially “X” shape when viewed from the side, so that the strength of the handle 14 and the resistance rod 15 attached to the bracket 68 can be reduced. Can be relatively high. Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do. As described above, according to the present invention, the engine
Handle and resistance bar are attached to a member that is integral with the main body
Of a transmission case that has an integrated bracket
Since the upper end is directly connected, the number of parts can be reduced by eliminating the frame and brackets, etc., which were conventionally required between the engine body and the transmission case, and the assembly work can be facilitated with the reduction in the number of parts. Also, the connection strength between the engine body and the transmission case can be sufficiently increased by the reduced number of parts. In particular, in the present invention, the transmission case and
Opened to the left and right sides in a single unitary bracket
A pair of left and right pipe supports each having a semicircular cross section
The upper end of the resistance bar can be inserted between the pipe and the pipe support.
The upper end of the resistance bar can be fixedly mounted with a functional insertion hole
And a pair of right and left pie
A pair of left and right pipes forming the front part of the handle
It causes almost half of the front end, respectively Re its fitted, its both
On the opposite side of the pipe support part, a pair of left and right
The holding members are brought into contact with each other,
The bracket is attached to the bracket.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a walking cultivator. FIG. 2 is a plan view of a walking type cultivator. FIG. 3 is an upper longitudinal sectional view of a tilling unit. FIG. 4 is a lower longitudinal sectional view of the tilling unit. FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG. FIG. 6 is a sectional view taken along line 6-6 in FIG. 5; FIG. 7 is an enlarged sectional view taken along line 7-7 of FIG. [Description of Signs] 12 ... Power transmission unit 13 ... Tilling unit 14 ... Handle 15 ... Resistance rod 18 ... Engine body 32 ... Engine cover 45 as a member integral with the engine ... Power take-out shafts 51, 52 ... Pawl rotor 53 ... Power transmission mechanism 54 ... Mission case 68 ... Bracket 69 ... Pipe 78 ... Pipe support 79 ... Pressing member 82 insertion hole 83 resistance rod support E engine T walking cultivator

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A01B 33/02 A01B 33/08 B62D 51/06

Claims (1)

(57) Claims 1. An engine (E) having a power take-off shaft (45) projecting downward, and claw rotors (51, 52) disposed below the engine (E). And the power take-off shaft (4
5) and a power transmission mechanism (53) between the pawl rotors (51, 52) built in a transmission case (54) and a power transmission section (12) disposed below the engine (E). A walker in which a handle (14) extending rearward and upward on the rear side of the tillage unit (13) and a resistance rod (15) extending rearward and downward below the handle (14) are connected to the tilling unit (13) including the tilling unit. In the field cultivator, the upper end of the transmission case (54) is directly connected to a member (32) integral with the engine body (18) of the engine (E), and is integrated with the transmission case (54). A semi-circular cross-section open to the left and right sides on a single bracket (68)
And a pair of left and right pipe support portions (78, 7
8) and a resistance rod between the two pipe supports (78, 78).
It has an insertion hole (82) through which the upper end of (15) can be inserted.
A resistor to which the upper end of the resistance bar (15) can be fixedly attached.
An anti-rod support portion (83) is provided integrally with the pair of left and right pipe support portions (78, 78).
A pair of left and right pipes (6
9 and 69), approximately half the circumference of the front end is fitted together.
At the opposite side of the two pipe supports (78, 78).
A pair of right and left holding members (7) are provided on the outer circumference of the pipe (69, 69).
9, 79) are brought into contact with each other.
Ip (69, 69) attached to the bracket (68)
A walking type cultivator characterized by the following features.