JP2010036773A - Power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission device capable of preventing an operating lifetime from being shortened, and capable of improving working efficiency. <P>SOLUTION: The power transmission device 100 transmits the power of an engine 8 having a crankshaft 31 disposed in a horizontal direction to a mowing machine 9 having an input shaft 12a disposed in a vertical direction and a rear axle drive unit 3 having an input shaft 4a. The power transmission device is equipped with a driving axle 120 disposed in parallel to the crankshaft 31, the first driven shaft 130 or the like disposed perpendicularly relative to the crankshaft 31, a belt mechanism 180 for transmitting the power of the crankshaft to the driving axle 120, bevel gears 160, 160 for transmitting the power of the driving axle 120 to the first driven shaft 130 and the second driven shaft 140, a belt mechanism 190 for transmitting the power of the first driven shaft 130 and the second driven shaft 140 to the input shaft 12a and the input shaft 4a, and a gearbox 110 which includes the driving axle 120 and the first driven shaft 130 and is attached on the body side of a working vehicle 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technology of a power transmission device that transmits power of an engine having a crankshaft arranged in a horizontal direction to a shaft arranged in a direction perpendicular to the crankshaft.

Conventionally, a technique of a power transmission device that transmits power of an engine having a crankshaft arranged in a horizontal direction to a shaft arranged in a direction perpendicular to the crankshaft is known (for example, Patent Document 1). reference).
Here, a work vehicle including a power transmission device according to a conventional example will be described with reference to FIG.
The work vehicle 501 is an Ackermann-steered lawn mower, and includes an engine 508 having a crankshaft 531 in the front-rear and horizontal directions, and a mower 509 having an input shaft 512a arranged in a direction perpendicular to the crankshaft 531. I have. A crank pulley 533 is fixed to the crankshaft 531 of the engine 508, and an input pulley 512b is fixed to the input shaft 512a of the mower 509. A counter shaft 590 is disposed below the engine 508 in the horizontal direction, and a pair of left and right counter pulleys 591 and 591 are fixed to the counter shaft 590. An endless belt 512c is wound around the crank pulley 533, the pair of left and right counter pulleys 591 and 591, and the input pulley 512b. The rotary blade 512 of the mower 509 is driven by being transmitted to the belt 512c, the input pulley 512b, and the input shaft 512a.
As described above, the power transmission device 600 is configured by the crank pulley 533, the input pulley 512b, the counter shaft 590, the counter pulleys 591 and 591, and the belt 512c.
Japanese Utility Model Publication No. 60-10427

  However, since the conventional power transmission device 600 transmits the power of the crankshaft 531 disposed in the horizontal direction to the input shaft 512a disposed in the vertical direction, the belt 512c is twisted by the counter pulleys 591 and 591. As a result, there is a problem that the service life of the belt 512c is shortened. Further, when the power transmission device 600 is assembled to the work vehicle 501, there is a problem that work efficiency is poor because the belt 512c needs to be assembled while being twisted.

  The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

  That is, according to the first aspect, the power of the engine having the crankshaft arranged in the horizontal direction provided in the work vehicle is transmitted to the work machine and / or the axle drive device having the input shaft arranged in the vertical direction. A power transmission device configured to transmit a drive shaft disposed parallel to the crankshaft, a driven shaft disposed perpendicular to the crankshaft, and power of the crankshaft to the drive shaft. A first endless belt mechanism, a gear train that transmits power of the drive shaft to the driven shaft, a second endless belt mechanism that transmits power of the driven shaft to the input shaft, the drive shaft and the driven shaft; And a power transmission case attached to the machine body side of the work vehicle.

  According to a second aspect of the present invention, the power transmission case is attached to a vehicle frame of the work vehicle.

  According to a third aspect of the present invention, the power transmission case is attached to a vehicle frame of the work vehicle via a support member.

  According to a fourth aspect of the present invention, the power transmission case is attached to an axle support case of the work vehicle.

  According to a fifth aspect of the present invention, the second endless belt mechanism includes a clutch that connects and disconnects transmission of power from the driven shaft to the input shaft.

  In the present invention, the clutch is attached to the power transmission case.

  As effects of the present invention, the following effects can be obtained.

  In claim 1, since the belt which is the endless belt constituting the first endless belt mechanism and the second endless belt mechanism is not twisted in a state where it is assembled to the work vehicle, the service life of the belt is reduced. Can be prevented. Moreover, since it is not necessary to twist when the belt is assembled to the work vehicle, work efficiency can be improved. Furthermore, since the power transmission case is not directly attached to the engine, it is possible to suppress the occurrence of a problem in the power transmission device due to the vibration of the engine.

  In claim 2, by using the vehicle frame, the power transmission case can be attached to the work vehicle with a simple configuration. Moreover, by attaching to the highly rigid vehicle frame, the power transmission device can be more firmly attached to the work vehicle.

  According to the third aspect, even when the power transmission case cannot be directly attached to the vehicle frame, the power transmission case can be attached to the work vehicle via the support member. Further, by indirectly attaching to the highly rigid vehicle frame, the power transmission device can be more firmly attached to the work vehicle.

  In claim 4, by using the axle support case, the power transmission case can be attached to the work vehicle with a simple configuration. Further, the power transmission device can be more firmly attached to the work vehicle by being attached to the highly rigid axle support case.

  According to the fifth aspect of the present invention, it is possible to switch between transmission and cut-off of power to the working machine and the axle drive device which are the driving targets of the engine, so that the convenience of the engine can be improved.

  According to the sixth aspect of the present invention, since the clutch has the same vibration system as that of the power transmission case, it is possible to simplify the anti-vibration measure and reduce the cost.

  Next, embodiments of the invention will be described.

First, an overall configuration of a work vehicle 1 including a power transmission device according to an embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 1, the work vehicle 1 is an Ackerman-steered lawn mower, and is supported on a vehicle frame 2, a rear axle drive device 3 supported on the rear portion of the vehicle frame 2, and a front portion of the vehicle frame 2. A front axle support device 6, an engine 8 supported by the vehicle frame 2 between the rear axle drive device 3 and the front axle support device 6, and a mower suspended below the vehicle frame 2 so as to be movable up and down. 9 and.
The front axle support device 6 includes a front axle support case 6a that houses a mechanism such as a shaft and gears for supporting the front wheels 7 and 7. The front axle support case 6a is an embodiment of the axle support case according to the present invention. In addition, the rear axle drive device 3 includes a rear axle drive case 3a that houses mechanisms such as a shaft and a gear for supporting and driving the rear wheels 5 and 5. The front axle support case 6a and the rear axle drive case 3a are attached to the vehicle frame 2 by an appropriate method.
The work vehicle according to the present invention is not limited to the work vehicle 1 in the present embodiment, and may be other work vehicles such as agricultural work vehicles and construction work vehicles.

The vehicle frame 2 is a pair of left and right rectangular plate members whose longitudinal direction substantially coincides with the longitudinal direction of the work vehicle 1, and a rectangular plate member that connects the upper ends of the side plates 2a and 2a. A plate 2b and the like are provided (see FIGS. 2 and 3).
The configuration of the vehicle frame according to the present invention is not limited to the same configuration as the vehicle frame 2 in the present embodiment, and a configuration including more plate-like members, a box shape, or the like is also possible. .

  The rear axle drive device 3 which is an embodiment of the axle drive device according to the present invention houses a hydraulic motor 4, and the hydraulic motor 4 is fluidly connected to be drivable by a hydraulic pump (not shown). The hydraulic pump is driven by power transmitted to the input shaft 4a.

  The engine 8 is housed in the hood 13, and a handle 14 extends rearward and upward from the dashboard immediately after the hood 13, and a radiator 15 is mounted on the vehicle frame 2 immediately before the engine 8. In the bonnet 13, a reservoir tank 16 for supplying hydraulic oil to a hydraulic cylinder or the like is disposed behind the engine 8.

  Further, a rear cover 17 is mounted on the rear portion of the vehicle frame 2, and a driver seat 18 is mounted on the upper surface of the rear cover 17. A rear axle drive device 3 is disposed in the rear cover 17.

A mower 9 as an embodiment of the working machine according to the present invention is provided between the rear wheels 5 and 5 driven by the rear axle drive device 3 and the front wheels 7 and 7 supported by the front axle support device 6. The vehicle frame 2 is disposed below. The left and right mower hangers 10 and 10 are connected to the front end portions of the left and right side plates 2a and 2a of the vehicle frame 2, respectively. The mower hangers 10 and 10 are connected to the front ends of the mowers 9 through the link rods 11 and 11, respectively. As a result, the mower 9 is suspended so as to be movable up and down. Further, the rotary blade 12 of the mower 9 is driven by the power transmitted to the input shaft 12a.
The working machine according to the present invention is not limited to the mower 9 in the present embodiment, but may be various other working machines that are mounted on the work vehicle 1 and perform work.

Next, the engine 8 included in the work vehicle 1 will be described with reference to FIGS. 2 and 3.
As shown in FIGS. 2 and 3, the engine 8 includes an oil pan 20 at a lower portion, a cylinder block 30 at an upper portion of the oil pan 20, and a cylinder head 40 at an upper portion of the cylinder block 30.

  A crankshaft 31 is installed in the cylinder block 30 in the front-rear horizontal direction, and front-rear ends of the crankshaft 31 protrude from front-rear surfaces of the cylinder block 30, respectively. A flywheel 32 is fixed to the rear end portion of the crankshaft 31, and a first crank pulley 33 and a second crank pulley 34 are fixed to the front end portion of the crankshaft 31 in order from the front. .

  A cooling fan 50 is disposed above the crankshaft 31. A pulley 52 is fixed to the fan shaft 51 of the cooling fan 50, and a cooling water pump 53 is attached to the fan shaft 51. An alternator 60 is disposed on the side of the cooling fan 50, and a pulley 62 is fixed to an alternator shaft 61 of the alternator 60.

  A single belt 63 is wound around the second crank pulley 34 of the crankshaft 31, the pulley 52 of the fan shaft 51, and the pulley 62 of the alternator shaft 61. Power from the crankshaft 31 is transmitted through the belt 63, and the cooling fan 50, the cooling water pump 53, and the alternator 60 are driven.

  Further, on the front side of the cylinder head 40, a gear case 42 that houses a fuel injection pump 41 and a gear group (not shown) for driving a cam shaft (not shown) is disposed.

Engine brackets 35 and 35 are fixed to both side surfaces of the cylinder block 30. The engine brackets 35 and 35 are plate-like members formed in an L shape when viewed from the front (FIG. 3), one surface of which is fixed to the side surface of the cylinder block 30, and the other surface is a vibration isolating member. It is fixed to the upper plate 2b of the vehicle frame 2 through 36 and 36.
The vibration isolating members 36 and 36 are not limited in material and shape as long as they can absorb the vibration of the engine 8 and can attenuate the vibration propagating from the engine 8 to the vehicle frame 2.

Next, a power transmission device 100 as an embodiment of the power transmission device according to the present invention will be described with reference to FIGS.
As shown in FIG. 4, a gear box 110 which is an embodiment of a power transmission case according to the present invention outputs a drive shaft 120 to which power from the crankshaft 31 is input, and outputs power from the drive shaft 120. The first driven shaft 130 and bevel gears 160 and 160 that transmit the power of the drive shaft 120 to the first driven shaft 130 are internally provided.

As shown in FIGS. 2 and 3, a mounting portion 112 is provided on the upper portion of the gear box 110. The attachment portion 112 is fixed to the upper portion of the gear box 110 (or formed integrally with the gear box 110), and both left and right end portions protrude from the left and right side surfaces of the gear box 110 in a front view (FIG. 3). The gear box 110 is attached to the vehicle frame 2 by bringing the upper surface of the mounting portion 112 into contact with the lower surface of the upper plate 2b of the vehicle frame 2 and screwing the bolt 113 from below in the protruding portion of the mounting portion 112. Can be attached.
The method for attaching the gear box 110 to the vehicle frame 2 is not limited to the method described in this embodiment, and any method that allows the gear box 110 to be attached to the vehicle frame 2 may be used.
In the present embodiment, the gear box 110 is attached to the vehicle frame 2, but the present invention is not limited to this. That is, the gear box 110 may be configured to be attached to the machine body side of the work vehicle 1. The “airframe side” of the work vehicle 1 is, for example, the vehicle frame 2, the front axle support case 6 a of the front axle support device 6, the rear axle drive case 3 a of the rear axle drive device 3, and a transmission case (not shown). There is a member other than the engine 8 having such a rigidity that the gear box 110 can be supported as a structure of the work vehicle 1.

The drive shaft 120 is disposed below the crankshaft 31 and parallel to the crankshaft 31 (front-rear horizontal direction). The drive shaft 120 is housed in the gear box 110 so as to protrude from the front portion of the gear box 110, and is rotatably supported by the gear box 110 via a bearing (see FIG. 4).
A driving pulley 121 is fixed to the front end portion of the driving shaft 120.

  As shown in FIG. 5, the belt 122 is wound around the drive pulley 121 of the drive shaft 120 and the first crank pulley 33 of the crankshaft 31. The first crank pulley 33 of the crankshaft 31, the drive pulley 121 of the drive shaft 120, and the belt 122 constitute a belt mechanism 180 that is an embodiment of the first endless belt mechanism according to the present invention.

  A tension pulley 170 serving as a tension member that applies tension to the belt 122 is in contact with the inner peripheral side of the belt 122. The tension pulley 170 is urged rightward in a front view (FIG. 5) by an elastic member (not shown) such as a spring to apply tension to the belt 122. The tension pulley 170 is attached via a bracket 172 to a member constituting the engine 8 such as the cylinder block 30 or a member constituting the work vehicle 1 other than the engine 8 such as the vehicle frame 2. A long hole 173 whose longitudinal direction is the left-right direction is opened in the bracket 172, and the pulley shaft 171 of the tension pulley 170 is slidably disposed in the long hole 173.

  As shown in FIGS. 2 and 3, the first driven shaft 130 is disposed vertically (up and down direction) with respect to the crankshaft 31. That is, the first driven shaft 130 is also arranged perpendicular to the drive shaft 120. The first driven shaft 130 is housed in the gear box 110 so as to protrude from the lower portion of the gear box 110, and is rotatably supported by the gear box 110 via a bearing (see FIG. 4).

  As shown in FIG. 4, bevel gears 160 and 160 which are an embodiment of the gear train according to the present invention are for transmitting the power of the drive shaft 120 to the first driven shaft 130. In the gear box 110, one bevel gear 160 is fixed to the end (rear end) of the drive shaft 120, and the other bevel gear 160 that meshes with the bevel gear 160 is the end (upper end) of the first driven shaft 130. Is fixed.

  A first driven pulley 131 is fixed to the lower end portion of the first driven shaft 130 by key fitting, and a second driven shaft 140 is detachably connected on the same axis as the first driven shaft 130. A belt 4c is wound between the first driven pulley 131 and a pulley 4b fixed to the upper end of the input shaft 4a (see FIG. 1).

A second driven pulley 141 is rotatably supported by the second driven shaft 140, and an electromagnetic wave that is an embodiment of the clutch according to the present invention is provided between the second driven shaft 140 and the second driven pulley 141. A clutch 150 is interposed. The electromagnetic clutch 150 switches between transmission and interruption of power from the second driven shaft 140 to the second driven pulley 141, and when electric power is supplied to the electromagnetic clutch 150 by operation of operating means arranged in the vicinity of the driver's seat 18, The clutch plate interposed between the second driven shaft 140 and the second driven pulley 141 is pressed against the electromagnetic force of the solenoid so that power can be transmitted. A belt 12c is wound between the second driven pulley 141 and the input pulley 12b fixed to the upper end of the input shaft 12a (see FIG. 1).
The first driven pulley 131, the pulley 4b, and the belt 4c, and the second driven pulley 141, the input pulley 12b, and the belt 12c constitute a belt mechanism 190 that is an embodiment of the second endless belt mechanism according to the present invention. ing.
The clutch is not limited to the electromagnetic clutch 150, and may be a hydraulic clutch, for example.

  As shown in FIGS. 2 and 3, boss portions 111 for attaching the electromagnetic clutch 150 are provided on the left and right side surfaces of the lower portion of the gear box 110. A thread groove is formed on the inner peripheral surface of the boss 111. A bolt hole 151 is formed in the electromagnetic clutch 150 at a position overlapping the boss portion 111 in plan view.

With such a configuration, the bolts 152 are screwed from below the bolt holes 151 in a state where the boss portions 111 of the gear box 110 and the bolt holes 151 of the electromagnetic clutch 150 are aligned in plan view, whereby the electromagnetic clutch 150 is inserted. Can be attached to the gear box 110. The configuration for attaching the electromagnetic clutch 150 to the gear box 110 is not limited to that in the present embodiment.
The drive shaft 120, the first driven shaft 130, the second driven shaft 140, the belt mechanism 180, the bevel gears 160 and 160, the belt mechanism 190, and the gear box 110, which are configured as described above, constitute one of the power transmission devices according to the present invention. The power transmission apparatus 100 which is an Example is comprised.

In the engine 8 configured as described above, the power of the crankshaft 31 is transmitted to the drive shaft 120 via the first crank pulley 33, the belt 122, and the drive pulley 121, as shown in FIGS. . As shown in FIG. 4, the power of the drive shaft 120 is transmitted to the first driven shaft 130 via the bevel gears 160 and 160. As shown in FIG. 1, the power of the first driven shaft 130 is transmitted to the first driven pulley 131, the belt 4c, the pulley 4b, and the input shaft 4a to drive the hydraulic pump (not shown). The power of the first driven shaft 130 is transmitted to the second driven shaft 140, the second driven pulley 141, the belt 12c, the input pulley 12b, and the input shaft 12a, and the rotary blade 12 of the mower 9 is driven.
In this way, the power of the crankshaft 31 arranged with the longitudinal direction as the horizontal direction can be transmitted to the input shaft 4a and the input shaft 12a arranged with the longitudinal direction as the vertical direction.

As described above, the power transmission device 100 according to the present embodiment includes the input shaft 12a that is provided in the work vehicle 1 and that has the power of the engine 8 having the crankshaft 31 disposed in the horizontal direction and that is disposed in the vertical direction. A power transmission device 100 for transmitting to a rear axle drive device 3 having a mower 9 and an input shaft 4 a, a drive shaft 120 arranged in parallel to the crankshaft 31 and perpendicular to the crankshaft 31 The first driven shaft 130 and the second driven shaft 140, the belt mechanism 180 that transmits the power of the crankshaft to the drive shaft 120, and the power of the drive shaft 120 to the first driven shaft 130 and the second driven shaft 140. The bevel gears 160 and 160 for transmitting, the belt mechanism 190 for transmitting the power of the first driven shaft 130 and the second driven shaft 140 to the input shaft 12a and the input shaft 4a, the drive shaft 120 and the first driven shaft. 130 and interior, in which includes a gear box 110 mounted on the body side of the working vehicle 1, a.
By configuring in this way, the belt 4c and the belt 122 are not twisted in the state where they are assembled to the work vehicle 1, so that the service life of the belt 4c and the belt 122 can be prevented from being reduced. Further, when the belt 4c and the belt 122 are assembled to the work vehicle 1, it is not necessary to twist the belt 4c and the belt 122, so that the work efficiency can be improved. Furthermore, since the gear box 110 is not directly attached to the engine 8, it is possible to suppress the occurrence of problems in the power transmission device 100 due to the vibration of the engine 8.
Further, since the gear box 110 is separated from the engine 8 and attached to the vehicle frame 2, there is no need to replace the gear box 110 or the like when the engine 8 is replaced with another engine, and the power transmission device 100 The versatility can be improved.

The gear box 110 of this embodiment is attached to the vehicle frame 2 of the work vehicle 1.
With this configuration, the gear box 110 can be attached to the work vehicle 1 with a simple configuration by using the vehicle frame 2. Moreover, the power transmission device 100 can be more firmly attached to the work vehicle 1 by being attached to the highly rigid vehicle frame 2.

The belt mechanism 190 includes an electromagnetic clutch 150 that connects and disconnects transmission of power from the second driven shaft 140 to the input shaft 12a.
By configuring in this way, it is possible to switch between transmission and interruption of power to the mower 9 that is the driving target of the engine 8, so that the convenience of the engine 8 can be improved.

The electromagnetic clutch 150 is attached to the gear box 110.
By configuring in this way, the electromagnetic clutch 150 becomes the same vibration system as that of the gear box 110, so that it is possible to simplify the anti-vibration measures and to reduce the cost.

In the present embodiment, the first driven shaft 130 and the second driven shaft 140 are configured by separate members, but the present invention is not limited to this, and the first driven shaft 130 and the second driven shaft 140 It is also possible to configure as a single unit (one driven shaft).
In the present embodiment, the power transmission device 100 includes two pulleys (first driven pulley 131 and second driven pulley 141) for outputting power, but the present invention is not limited to this. Instead, it is also possible to have one pulley or three or more pulleys.
In the present embodiment, the power transmission device 100 is configured to include one electromagnetic clutch 150. However, the present invention is not limited to this, and may be configured to include a plurality of electromagnetic clutches 150. is there.
In the present embodiment, the power transmission device 100 is configured to transmit power to the rear axle drive device 3 and drive the rear wheels 5, 5, but the present invention is not limited to this, and the front wheels 7, It is also possible to adopt a configuration in which the front wheels 7 and 7 and the rear wheels 5 and 5 are driven together.

Further, as shown in FIG. 6, the electromagnetic clutch 150 may be fixed to the vehicle frame 2 instead of the gear box 110. In this case, it is not necessary to provide the boss 111 described above in the gear box 110, and the bolt 152 can be screwed from below the bolt hole 151, and the electromagnetic clutch 150 can be attached to the upper plate 2b of the vehicle frame 2. is there.
The method of fixing the electromagnetic clutch 150 to the vehicle frame 2 is not limited to this.

In addition, as shown in FIG. 7, the work vehicle 1 may be configured to include a plurality of power transmission devices 100 (other than the first crank pulley 33 of the crankshaft 31). In this case, the belt 122 is wound around the first crank pulley 33 and the drive pulleys 121 and 121, and the power of the crankshaft 31 is transmitted to the drive pulleys 121 and 121 by the belt 122.
In such a configuration, the rotational speed of each power transmission device 100 can be set to a desired rotational speed by changing the diameter or the like of the drive pulley 121 of each power transmission device 100. As a result, it is possible to select an optimum rotation speed for the rear axle drive device 3 and the mower 9 that is a working machine, and it is possible to improve work efficiency.
7 is not limited to the configuration in which two power transmission devices 100 are provided, and a configuration in which three or more power transmission devices 100 are provided is also possible. It is also possible to provide a plurality of belts 122 and drive each driving pulley 121 with belts 122 independent of each other.

  Further, as shown in FIG. 8, the gear box 110 may be attached to the vehicle frame 2 via the support member 70.

The support member 70 is a rectangular plate member. For example, in a portion where the upper plate 2b of the vehicle frame 2 is not provided, the support member 70 is horizontally mounted so as to connect the upper ends of the side plates 2a and 2a, and is fixed to the side plates 2a and 2a by an appropriate method.
The engine 8 is fixed to the support member 70 via the engine brackets 35 and 35 and the vibration isolation members 36 and 36.
The gear box 110 is attached to the lower surface of the support member 70 with bolts 113.

As described above, the gear box 110 of this embodiment is attached to the vehicle frame 2 of the work vehicle 1 via the support member 70.
With this configuration, even when the gear box 110 cannot be directly attached to the vehicle frame 2 (for example, when it is necessary to attach the gear box 110 to a portion where the upper plate 2b of the vehicle frame 2 is not provided), it is supported. The gear box 110 can be attached to the work vehicle 1 via the member 70. Moreover, the power transmission device 100 can be more firmly attached to the work vehicle 1 by being indirectly attached to the highly rigid vehicle frame 2.
Further, as shown in FIG. 9, when the gear box 110 cannot be disposed below the engine 8 (the upper plate 2b of the vehicle frame 2) (for example, when another device or the like is disposed below the upper plate 2b). The gear box 110 can be attached to the vehicle frame 2 via the support member 70 by disposing the support member 70 in front of the upper plate 2b. In this case, the engine 8 is supported by the upper plate 2b, and the gear box 110 is supported by the support member.

  Moreover, as shown in FIG. 10, it is also possible to make it the structure which attaches the gear box 110 to the front axle support case 6a.

A mounting portion 112 is provided at the front portion of the gear box 110. The gear box 110 can be attached to the front axle support case 6a by bringing the front surface of the attachment portion 112 into contact with the rear surface of the front axle support case 6a and screwing the bolt 113 from the rear of the attachment portion. Thus, when attaching the front part of the gear box 110 to the front axle support case 6a, it can be set as the structure which makes the drive shaft 120 protrude from the rear part of the gear box 110, as shown in FIG.
The method for attaching the gear box 110 to the front axle support case 6a is not limited to the method described in the present embodiment, and any method can be used as long as the gear box 110 can be attached to the front axle support case 6a. In the present embodiment, the front surface of the gear box 110 and the rear surface of the front axle support case 6a are attached. However, the present invention is not limited to this, and the shapes of the gear box 110 and the front axle support case 6a are not limited thereto. Based on the positional relationship, the attachment position can be determined as appropriate. For example, a configuration in which the lower surface of the gear box 110 and the upper surface of the front axle support case 6a are attached may be employed.

As described above, the gear box 110 of this embodiment is attached to the front axle support case 6a of the work vehicle 1.
With this configuration, the gear box 110 can be attached to the work vehicle 1 with a simple configuration by using the front axle support case 6a. Moreover, the power transmission device 100 can be more firmly attached to the work vehicle 1 by being attached to the highly rigid front axle support case 6a.

The side view which showed the work vehicle provided with the power transmission device which concerns on 1st Example of this invention. The side view which similarly showed the engine and the power transmission device. Similarly front view. Side surface sectional drawing which similarly showed the power transmission device. The front view which similarly showed the 1st endless belt mechanism. The front view which showed the power transmission device which concerns on 2nd Example of this invention. The front view which showed the power transmission device which concerns on 3rd Example of this invention. The front view which showed the support structure of the power transmission device which concerns on 4th Example of this invention. The side view which showed the support structure of the power transmission device which concerns on 5th Example of this invention. The side surface enlarged view which showed the support structure of the power transmission device which concerns on 6th Example of this invention. The side view which showed the work vehicle provided with the power transmission device which concerns on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Work vehicle 2 Vehicle frame 3 Rear axle drive device (axle drive device)
6a Front axle support case (axle support case)
8 Engine 9 More (work machine)
31 Crankshaft 35 Engine bracket 36 Anti-vibration member 70 Support member 100 Power transmission device 110 Gear box (power transmission case)
120 Drive shaft 130 First driven shaft (driven shaft)
140 Second driven shaft (driven shaft)
150 Electromagnetic clutch (clutch)
160 Bevel gear (gear train)
180 Belt mechanism (first endless belt mechanism)
190 Belt mechanism (second endless belt mechanism)

Claims (6)

  A power transmission device for transmitting the power of an engine having a crankshaft disposed in a horizontal direction in a work vehicle to a work machine and / or an axle drive device having an input shaft disposed in a vertical direction, A drive shaft disposed parallel to the crankshaft; a driven shaft disposed perpendicular to the crankshaft; a first endless belt mechanism that transmits power of the crankshaft to the drive shaft; A gear train for transmitting the power of the drive shaft to the driven shaft, a second endless belt mechanism for transmitting the power of the driven shaft to the input shaft, the drive shaft and the driven shaft, and a body of the work vehicle And a power transmission case attached to the side.   The power transmission device according to claim 1, wherein the power transmission case is attached to a vehicle frame of the work vehicle.   The power transmission device according to claim 1, wherein the power transmission case is attached to a vehicle frame of the work vehicle via a support member.   The power transmission device according to claim 1, wherein the power transmission case is attached to an axle support case of the work vehicle.   The power transmission device according to any one of claims 1 to 4, wherein the second endless belt mechanism includes a clutch that connects and disconnects transmission of power from the driven shaft to the input shaft.   The power transmission device according to claim 5, wherein the clutch is attached to the power transmission case.

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