JPS6255014A - Power working machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a powered working machine such as a lawnmower.

(Prior Art) A working machine such as a self-propelled lawn mower includes a working means such as a cutter and a moving means such as wheels, both of which are driven by an engine.

If the engine is a vertical engine with a vertical crankshaft and horizontal cylinders, it rotates in a horizontal plane and can drive the cutter that mowing the lawn through its side clutch mechanism, but the wheels are driven separately from the engine. A transmission mechanism and a transmission mechanism are separately provided at the same location, and these are connected by a belt or the like for output.

(Problems to be Solved by the Invention) In the above-mentioned conventional technology, the transmission mechanism etc. are provided at a location away from the engine, which increases the size of the entire work machine.
Secondly, the power transmission system between the engine and the transmission mechanism is long, and is likely to be subject to design constraints such as layout.Furthermore, a cover covering the transmission mechanism, etc., or even a cover that covers the entire surface depending on the work environment, is required. This is disadvantageous in that the number of parts per unit increases and the number of assembly steps also increases.

The present invention has been made to solve the above-mentioned problems, and its purpose is to streamline the arrangement of the engine, transmission mechanism, etc. in working machines such as lawn mowers equipped with a vertical engine while making the arrangement of the engine, transmission mechanism, etc. more compact. To provide a power-operated working machine that can perform tasks.

(Means for solving the problem) The means for solving the above problem is that in a powered working machine equipped with a vertical engine with a vertically oriented crankshaft and a horizontally oriented cylinder, A cover is provided that forms a part of this end of the crankcase, and a transmission mechanism including a transmission mechanism for driving separate working means and moving means is provided within the cover, and the drooping output of the mechanism and the crankshaft is provided. The aim is to connect the departments.

(Works by the above means) According to the above means, the transmission mechanism etc. are provided in the cutter of which the crankcase is a part, so the engine and transmission mechanism are made compact, and since they are adjacent to each other, the power transmission system between them is also reduced. It can be shortened and simplified, and since a part of the cover also serves as the crankcase, it can be made smaller and simpler, and the number of parts can be reduced.

(Embodiment) Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In this embodiment, a lawn mower is shown as a working machine, and the working machine is not limited to the lawn mower but may be any other machine.

The frame (2) of the lawn mower (1) consists of horizontal members (3), (4) made of pipe materials etc. that are hung horizontally in the front and back, and a main body (5) in the front and back direction installed between them. is a press-molded monohook structure.

An engine (8) is mounted on the main body (5), and the engine (6) has a vertical crankshaft (7) and a cylinder (
8) is a horizontal vertical engine, and the crankcase (
The boss part (9a) provided at the lower end of the main body (5) is tied to the peripheral part of the opening (5a) provided in the main body (5) with the pole (10), and is mounted and supported on the main body (5). The cylinder (8) consists of a cylinder block (8a) and a cylinder head (8b), and the piston (11) and the pin part (7a) of the crankshaft (7) are connected by a horizontal connecting rod (12). Cooling fins (13) that also serve as a flywheel are fixed to the upper end (7b) of the crankcase (8) extending above the earthen wall (9b) of 7), and specifically, cooling fins (13) that also serve as a flywheel are fixed to the upper end (7b) of the crankcase (8) extending above the earthen wall (9b). fin (13)
b) ... is provided protrudingly, surrounded by a fan housing (14) above and around it, and a recoil starter (15) is provided on top of this.
), and furthermore, a fuel tank (16) is arranged thereon, and the tank (1B) is attached to the boss part (14a) of the housing (10 through the boss part (lea) at the right end in the figure) with a bolt (17).
), forming a cooling air intake duct (A) between the scar (18b) hanging around the tank (IB) and the shroud (18) provided around the cylinder (8); The tank (1B) on the engine was cooled. The coil starter (15) has a case (15a) attached to the boss part (14b) around the upward opening part (14b) of the housing (14).
14c) and (19) were used for binding and support.

A bearing post part (9d) is formed in the center of the bottom wall (8c) of the crankcase (3), and the lower end output part (7C) of the crankshaft (7) is extended downwardly from this part.
A pulley (20) is tied to C), a stay (20a) is provided on a part of the pulley (20), a centrifugal expansion type shoe (21a) is provided on this, and a drum (21b) is attached below this. A centrifugal clutch (21) is provided. Clutch (21
) is surrounded by a clutch housing (22),
The clutch housing (22) has a boss part (22b) provided on a part of the peripheral wall (22a) that is inserted from below into the boss part (8e) inside the already mentioned boss part (9a) at the lower end of the crankcase (8). ) (23) and support the housing (
A boss part (22d) is provided at the center of the bottom wall (22c) of 22), and the output shaft (21c) hanging from the center of the drum (21b) is fitted onto the boss part (22d), and the lower end of the shaft (21c) is suspended from the boss part (22d). Attach a blade-shaped cutter (24) to the.゛The wall (8f) on the radially outward side of the crankshaft web (7d) of the crankcase (9) and on the opposite side from the cylinder (8), the wall of the part that corresponds to the bottom wall of the engine in the horizontal direction of the crankshaft, the wall of the vertical engine Therefore, mission cover halves (91) are integrally formed with the crankcase (9) on the vertical wall on the opposite side from the cylinder, and extend upward and downward and rearward on the left and right sides, respectively. The boss part (8g) of the wall (9r) is divided into upper and lower parts, which are connected with bolts (25), and the lower end (91a) of the half-hole (91) is connected to the opening (5a) of the main body (5).
) A boss portion (91c) is formed at the rear end portion of the upper piece (91b) extending rearward and upwardly of the half-rest (91) facing above the peripheral rear portion;
The upper tip (92a) of the cover (82), which extends backward and has a curved shape, is overlapped with this and connected with bolts (2B), and the cover (82) is attached to the upper and rear surfaces of the wall (9f). ,
Cover the left and right sides and attach the lower part of the hanging rear wall (92b) to the member (
It is attached to the stay (93) which was set up from 0 via Pol) (2?). As a result, the space (which forms the transmission case, that is, the transmission case) covered by the crankcase (8) and the cover (92) on the rear half of the frame body (5) (
The upper wall (9b) of the crankcase (0 or more) and the half-shaft (91) forming the upper wall (91) of the crankcase also serve as the housing of the flywheel.

In this embodiment, a wheel drive transmission mechanism is provided in this space (S).

By the way, there are arms (2B) on the left and right front of the frame (2).
, (28), and a front wheel (29) that forms a rolling wheel on this;
(29), while the rear member of the frame (
4) Reduction case (3G) on both ends of (30)
is mounted and supported, and rear wheels (31
), (31) are installed and supported. Under the frame (2), a cutter housing (32) is provided which is molded from synthetic resin and has a reverse concave shape and can be opened from the front and back.
Connect the connecting bolt (33) between the boss portions (9e) and (22b) and between the rear boss portion (22e) of the clutch housing (22).
), the upper piece (32a) is bound, and in the figure (34), (
34) is a door plate pivotably supported at the front and rear openings of the housing (32).

To explain the speed change mechanism, there is a speed change shaft (35) in the space (S).
is mounted horizontally, and transmission friction plates (3B) and (37) are placed facing each other with a distance between them so as to be movable in the axial direction while transmitting rotation on the shaft (35). A driving friction roller (38) is provided below and perpendicular to this.

The shaft (38) of the roller (38) hangs below the main body (5), and a pulley (40) is provided at the lower end (39a) of the shaft.
8) and the output part (7c) are separated and parallel to each other, and the pulley (20) and the pulley (40) provided in this part are connected to the belt (4).
1), (42) is a tension pulley, and shaft (3)
3) is a pulley (0 or more) supported by a bearing (43).
20), (4G), bell) (41) faces between the main body (5) and the upper surface (32a) of the housing (32) and is covered from the outside.

As a result of the above, the engine output is
1), it will be transmitted to the roller (38) via the boot 9 (40) and the shaft (39). By the way, the friction plate (3
B), (37) is a symmetrical plan view type operation arm (4
4) , (44) , and the arms (44) , (
44) engages with the roller (3B) on the shaft (35) or slides in the direction of separation, and one of the friction plates (3B) engages with the roller (3B), and one engages with (37). In this case, it rotates in the forward or reverse direction and selectively drives the shaft (35) in the forward or reverse direction. At both ends of the shaft (35), for example, there are screws (45
), the sprocket faces into the upper part of the base of the left and right reduction cases (30), (30), and
4) Fix the sprocket (47) with both ends of the intermediate shaft (4B) that has been passed through facing the middle part of the reduction case (30) and (3G), and insert a check between both (45) and (47). 7 (48), and the pinion (49) provided at the outermost end of the shaft (4B) is meshed with the internally toothed ring gear (31a) provided on the inner periphery of the rear wheel (31). Thus the rear wheel (3
1) and (31) move forward and backward using a transmission mechanism.

Select correctly and run.

Figure 3 shows a side view of the power lawn mower, and shows the cover (
92) Handle (51) via stay (50) upwards
A post (52) is mounted and supported, and a cover (82)
A fender (53) is provided around the .

As described above, a power lawn mower was constructed.

(Effects of the Invention) As described above, according to the present invention, in a work machine equipped with a vertical engine, the cover is installed by utilizing the outside of the wall of the crankcase on the side opposite to the cylinder that houses the vertical crankshaft. By installing a transmission case, the transmission case can be installed while covering the transmission mechanism by using the dead space behind the crankcase on the fuselage, which is advantageous in terms of space utilization, and makes it easier to install the transmission mechanism. The machine can be made smaller, and since the engine crankshaft and the transmission mechanism are adjacent to each other, the power transmission system from the crankshaft to the transmission mechanism is short and simplified, simplifying the entire transmission mechanism. Since the cover is constructed using the crankcase, it is easier to attach and support the cover, and there are fewer parts for the cover and transmission case.The transmission mechanism can be covered with the minimum number of parts, and the cost is reduced due to the above. There are advantages such as being advantageous.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; Fig. 1 is a longitudinal side view of a power lawn mower, Fig. 2 is a plan view with the engine and cover removed, and Fig. 3 is an external side view of the lawn mower. It is a diagram. In the drawings, (1) is the work equipment, (6) is the engine, (7) is the crankshaft, (8) is the cylinder, (8) is the crankcase, (82) is the cover, and (35) to (3θ) are the It is a transmission mechanism.

Claims (1)

[Claims] 1. In a power-powered working machine equipped with a vertical engine with a vertical crankshaft and a horizontal cylinder, a cover on the opposite side of the crankcase from the cylinder is a part of the wall on this side of the crankcase. A power type, characterized in that a transmission mechanism including a transmission mechanism for driving separate working means and moving means is provided in the cover, and the mechanism and the drooping output portion of the crankshaft are linked. work equipment. 2. The powered working machine according to claim 1, wherein the drooping output portion of the crankshaft drives the working means, and the transmission mechanism changes the speed of the moving means.