JPH04159137A - Power take-out device of internal combustion engine for mounting on working machine - Google Patents

Abstract

PURPOSE:To simplify a power transmission construction and reduce power loss by supporting a 1st shaft parallel to a crank shaft and 2nd shaft vertical to the 1st shaft by bearings in an oil pan, interlocking them by gears, and taking power from a projected part of the 2nd shaft projected from the oil pan. CONSTITUTION:A crank shaft 12 of a diesel engine 4 positioned horizontally is supported by a cylinder block 13, and both ends of it are projected from the cylinder block 13 to the outside. An oil pan 15 is mounted detachably on the underside of the cylinder block 13 by means of bolts 60. In this case, a 1st shaft 16 positioned parallel to the crank shaft 12 and a 2nd shaft 17 positioned vertical to the 1st shaft are supported by bearings 18 to 21 assembled integrally into the oil pan 15. Also, the crank shaft 12, 1st shaft 16, and 2nd shaft 17 are interlocked by gears 28 to 31. In addition, the lower end of the 2nd shaft 17 is projected from around the center of the oil pan 15 and power' is taken out from this projected part' of the shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is an internal combustion engine installed in a working machine such as a ride-on motor, which uses power from a horizontally arranged crankshaft. Regarding a take-out device.

(Prior Art) FIG. 5 relates to a conventional example and shows a riding mower 101 as an example of a working machine. An internal combustion engine 103 with a horizontally arranged crankshaft 102 is mounted on the body of the riding mower 101, and a mower main body 104 is attached to the lower part of the body.

A crankshaft 102 protruding forward from the internal combustion engine 103 and a power take-off shaft 105 attached to the vehicle body are interlocked by a belt-wrapped transmission mechanism 106, and the power take-off shaft 105 and the power receiving shaft 107 of the mower body 104 To is the second
They are interlocked via a belt winding transmission mechanism 108.

The V-belt 109 of the second belt-wrapping transmission mechanism 108 is bent in the middle by the intermediate pulley 110 because the power take-off shaft 105 and the power reception shaft 107 are arranged orthogonally.

(Problem to be Solved by the Invention) According to the above conventional example, the power of the internal combustion engine 103 is extracted via the belt-wrapping transmission mechanism 106 and the second belt-wrapping transmission mechanism 108, but each belt-wrapping transmission mechanism Mechanism 106.1
08 is disposed in front of the internal combustion engine 103, there is a problem in that the overall length of the riding mower 101 becomes large.

Furthermore, since power is transmitted from the crankshaft 102 to the power take-off shaft 105 via a belt, reliability is lacking.

Furthermore, if the power take-off shaft 105 and the power reception shaft 107 are disposed orthogonally, the V-belt 109
The power transmission structure is complicated, the power loss is large (and assembly is difficult).

(Means for Solving the Problems) An object of the present invention is to provide a power take-off device that can solve the problems in the prior art described above in an internal combustion engine mounted on a working machine in which the crankshaft is arranged horizontally. .

The present invention is characterized in that, in an internal combustion engine mounted on a working machine, in which the crankshaft is arranged horizontally, a first axis parallel to the crankshaft and a second axis arranged orthogonally to the first axis are provided.
The crankshaft, the first shaft, and the second shaft are supported by a bearing integrated with the oil pan inside an oil pan that is removably attached to the lower part of the main body of the internal combustion engine, and the crankshaft, the first shaft, and the second shaft are
The second shaft is interlocked with the second shaft by a gear, and the second shaft projects from the bottom of the oil pan, and power is extracted from the projecting portion of the second shaft.

(Function) According to the configuration of the present invention, the rotational power of the crankshaft is transmitted to the first shaft via the gear, and from the first shaft to the second shaft via the gear. The second shaft protrudes from the bottom of the oil pan, and power is extracted from this protrusion.

This allows power to be extracted from below the internal combustion engine. Furthermore, since the power transmission from the crankshaft to the second shaft is via gears, it is more reliable than via a belt.

Since the power is taken out from the second shaft, which is arranged orthogonally to the first shaft parallel to the crankshaft, even if the power receiving shaft of the working machine is arranged vertically, the second shaft Since the power receiving shaft is parallel to the power receiving shaft, there is no need to bend the belt when power is transmitted by the belt-wrapping transmission mechanism.

Furthermore, since the first shaft and the second shaft are supported inside the oil pan by bearings that are integrated with the oil pan,
Before installing the oil pan to the lower part of the main body of the internal combustion engine, the first shaft and the second shaft are assembled to the oil pan in advance to form an assembly.
Installation can be carried out in this assembled state.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 2 shows a working machine - a riding mower 1 as an example. This riding mower 1 has a vehicle body supported by front wheels 2 and rear wheels 3, and a diesel engine 4 as an internal combustion engine is mounted on the front part of the vehicle body. It is said to have a driving section with seats 7, etc.

Further, a mower main body 8 is attached to the lower part of the vehicle body between the front and rear wheels 2.3 via a hanging mechanism 9 so as to be able to rise and fall freely. The mower main body 8 has a cutting blade that is rotationally driven around a vertical axis, and a power receiving shaft 10 for driving the cutting blade projects upward. The power extracted from the diesel engine 4 is transmitted to the power receiving shaft 10 of the mower body 8 via the belt winding transmission mechanism 11.

FIG. 1 shows a power extraction device from a diesel engine 4, and the diesel engine 4 is a three-cylinder engine having a horizontally arranged crankshaft I2. The crankshaft 12 is supported by a cylinder block 13 that constitutes the main body of the diesel engine 4, and has both ends protruding from the cylinder block 13 to the outside. A pulley 60' of a winding transmission mechanism for driving a radiator fan (not shown) is attached to the front end of the crankshaft 12, and a flywheel I4 is attached to the rear end of the crankshaft 12.

An aluminum die-cast sill pan 15 is detachably attached to the lower part of the cylinder block 13 constituting the main body of the diesel engine 4 with bolts 60. Inside the oil pan 15, a first shaft 16 parallel to the crankshaft 12 and a second shaft 17 disposed perpendicular to the first shaft 16 are supported. The first shaft 16 and the second shaft 17 are connected to a bearing 18 that is integrated into the oil pan 15.
．． 19.20.21.

That is, the bearing 18.19 supporting the first shaft 16 is fitted into the bearing holder 24.25, and the bearing holder 24,2
5 is attached to supports 22 and 23 integrally formed with the oil pan 15.

Further, a bearing 20 . 21 that supports the second shaft 17 is fitted into a cylindrical bearing holding portion 26 that is integrally formed with the oil pan 15 . Note that the bearing 20 that supports the second shaft 17
A spacer 27 is interposed between the bearing 21 and the bearing 21 in the axial direction.

The crankshaft 12, the first shaft 16, and the second shaft 17 are interlocked by gears 28, 29, 30, and 31.

That is, the helical gear 28 is attached to the end of the crankshaft 12 on the side where the flywheel 14 is attached by shrink fitting, and the helical gear 29 meshing with this helical gear 28 is attached to the rear end of the first shaft 16 by shrink fitting. installed. Also, a bevel gear 3 is provided at the front end of the first shaft 16.
0 is attached with a bolt 61, and this bevel gear 30
A bevel gear 31 that meshes with is attached to the upper end of the second shaft 17 by a bolt 62.

Note that between the gear 28 and the flywheel 14,
A dust seal 49 is attached to the outer periphery of the crankshaft 12 via a dust seal cover 50.

The lower end of the second shaft 17 protrudes from approximately the center of the oil pan 15, and power is extracted from the protrusion of the second shaft 17. Note that an oil seal 63 is attached to the outer periphery of the second shaft 17.

In this embodiment, as shown in FIG.
An output shaft 34 is connected to the lower end of the second shaft 17 protruding from the second shaft 17 via a clutch device 33, and power to the output shaft 34 can be freely connected and disconnected. Pulleys 35 and 36 are attached to the output shaft 34 and the power receiving shaft 1o of the mower main body 8, and a V-belt 37 is wound around both pulleys 35 and 36, thereby forming the belt winding transmission mechanism 11, Power from the diesel engine 4 is transmitted to the mower body 8.

A pulley 38 is attached to the second shaft 17 protruding from the oil pan 15 above the clutch device 33, and a V-belt is connected to this pulley 38 and a pulley 40 attached to an intermediate shaft 39 supported by the vehicle body. 41 is wrapped around it. The intermediate shaft 39 is connected to H3 via bevel gears 42.43.
The driving system output shaft 45 of this H3T device 44 is interlocked with the input shaft 44a of the T device 44, and the PTO system output shaft 47 of the H3T device 44 is interlocked with the differential device 46 of the rear wheel 3.
is operatively connected to the PTO shaft 48 via a transmission.

According to the configuration of the above embodiment, the rotational power of the crankshaft 12 is transmitted to the first shaft 16 via the helical gear 28.29, and from this first shaft 16 to the second shaft 17 via the bevel gear 30.31. The power is transmitted from the second shaft 17 to the mower body 8 via the clutch device 33, output shaft 34, belt winding transmission mechanism 11, and power receiving shaft 10.

In this way, by extracting power from the second shaft 17 protruding from the bottom of the oil pan 15, the power transmission mechanism to the mower body 8 can be placed below the diesel engine 4, and the overall length of the riding mower can be reduced. You can prevent it from getting bigger.

Furthermore, since the power is transmitted from the crankshaft 12 to the second shaft 17 via the gears 28, 29, 30, and 31, it is more reliable than transmission via a belt.

Furthermore, since the second shaft 17 and the power receiving shaft 1o are parallel, there is no need to bend the V-belt 37 of the belt-wrapping transmission mechanism 11 that interlocks the second shaft 17 and the power receiving shaft 1o, thereby transmitting power. It has a simple structure, low power loss, and easy assembly.

In addition, when installing the oil pan 15 to the cylinder block 13 on the main body side of the diesel engine 4, the first shaft 16 and the second shaft 17 are installed in the oil pan I5 in advance by the bearing 18.
19, 20, 21, and both shafts 16,1
By attaching gears 29, 30, and 31 to 7 in advance to form an assembly, it is possible to attach the gears 29, 30, and 31 in the assembled state. This facilitates assembly when assembling the engine 14 or when attaching the oil pan 15, which has been removed during maintenance and inspection, to the engine body.

Furthermore, in the above embodiment, from the crankshaft 12 to the first shaft 16
A gear 28 for transmitting power to the crankshaft 12 is attached to the side of the crankshaft 12 on which the flyhole 14 is attached. As a result, since the torsional vibration of the crankshaft 12 is smaller at the rear end side where the flywheel I4 is attached than at the front end side, the tooth contact noise caused by the vibration of the gears 28 and 29 is reduced, and the tooth damage is also prevented.

3 and 4 show different embodiments, the same parts as in the previous embodiment are designated by the same reference numerals, and differences will be explained.

First, in the above embodiment, the first shaft 16 and the second shaft 17 were each supported by a pair of single row ball bearings 18, 19, 20, 21, but in this embodiment, the first shaft 16 and the second shaft 17 were supported by a pair of double row ball bearings, 52, and is supported by single row roller bearings 53 and 54.

Further, in the embodiment described above, the bearings 18.19 of the first shaft I6 were fitted into the bearing holders 24.25, but in this embodiment, the double row ball bearing 51 and the single row roller bearing 53 of the first shaft 16 are built into the bearing box 55 and separated from each other by a spacer 56. The bearing housing 55 is attached to the support 22.23 by bolts 57. Also, oil pan 15
The oil seal 67 between the second shaft 17 and the second shaft 17 is attached to the oil pan 15 via a case 69 that is attached to the oil pan 15 with bolts 68 .

The rest is the same as the above embodiment.

Note that the present invention is not limited to the above embodiments.

For example, the present invention can also be applied to internal combustion engines mounted on working machines other than riding mowers.

(Effects of the Invention) According to the present invention, the second
By protruding the shaft and extracting power from this protrusion, the power extraction transmission mechanism can be disposed below the internal combustion engine, and the overall length of the working machine can be prevented from increasing.

Furthermore, since power is transmitted from the crankshaft to the second shaft through gears, it is more reliable than through a belt.

In addition, since the second shaft is arranged perpendicularly to the first axis which is parallel to the crankshaft which is arranged horizontally, the second axis is parallel to the power receiving shaft which is arranged vertically of the working machine, and the belt winding transmission Even when power is transmitted by a mechanism, there is no need to bend the belt, which simplifies the power transmission mechanism, reduces power loss, and facilitates assembly.

Furthermore, when installing the oil pan to the lower part of the main body of the internal combustion engine, the first shaft and the second shaft can be assembled to the oil pan in advance to form an assembly, and the installation can be carried out in this assembled state. It is possible to facilitate the

[Brief explanation of drawings]

1 to 4 relate to an embodiment of the present invention, FIG. 1 is a side sectional view of a power take-off device, FIG. 2 is an explanatory diagram of the configuration of a riding mower, and FIG. 3 is a different embodiment. 4 is a bottom view of FIG. 3, and FIG. 5 is a diagram illustrating the configuration of a conventional riding mower. 1... Riding mower, 4... Diesel engine, 1
2...Crankshaft, 15...Oil pan, 16...
・1st axis, 17...2nd axis, 18.19.20.21
...bearing, 28.29.30.31...gear. Patent applicant Yanmar Diesel Co., Ltd. Agent Patent attorney Susumu Nemoto (and 1 other person) 6F

Claims (1)

[Claims] (1) In an internal combustion engine for mounting a work machine in which a crankshaft is arranged horizontally, a first axis parallel to the crankshaft and a second axis arranged perpendicular to the first axis are connected to the main body of the internal combustion engine. It is supported by a bearing integrated into the oil pan, which is removably attached to the bottom of the oil pan.
The crankshaft, a first shaft, and a second shaft are interlocked by gears, the second shaft protruding from the bottom of the oil pan,
A power extraction device for an internal combustion engine mounted on a working machine, characterized in that power is extracted from the protrusion of the second shaft.