JPH0742246Y2 - Power transmission device for work equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a power transmission device for a working machine connected to a moving vehicle.

2. Description of the Related Art Conventionally, as a power transmission device for a working machine which is used by being connected to a moving vehicle, the one shown in FIG. First,
A mower 4, which is a working machine, is arranged between a front wheel 2 and a rear wheel 3 of the moving vehicle 1, and the mower 4 is linked by a link 5 so as to be movable up and down.

The engine 6 of the moving vehicle 1 is provided with an output shaft (not shown) projecting rearward and an output shaft 7 projecting forward, and the output shaft projecting rearward is a transmission (Fig. It is connected to the rear wheel 3, which is a driving wheel, via a not shown). On the other hand, a pulley 8 is provided at the tip of the output shaft 7.
And a pulley 10 fixed to one end of an intermediate shaft 9 arranged in parallel with the output shaft 7 below the engine 6.
A belt 11 for power transmission is wound between the belt and the pulley 8. A belt 15 is wound between a pulley 12 fixed to the other end of the intermediate shaft 9 and a pulley 14 fixed to an intermediate shaft 13 arranged below the intermediate shaft 9.

Next, the mower 4 has a rotary shaft having a vertical axis.
16 and a cutting blade 17 fixed to the lower end of the rotary shaft 16 are provided, and a bevel gear 18 is fixed to the upper end of the rotary shaft 16. The bevel gear 18 meshes with a bevel gear 20 fixed to one end of a mower shaft 19 having a horizontally oriented shaft center, and the other end of the mower shaft 19 and the intermediate shaft 13 are connected to a universal joint 21.
Are connected via.

In such a configuration, the power from the engine 6 is transmitted from the output shaft 7 to the intermediate shafts 9 and 13, and further, the universal joint 21
Is transmitted to the mower shaft 19 via the
The cutting blade 1 is transmitted to the rotary shaft 16 through 20,18.
7 is driven to rotate.

Here, when the mower 4 is moved in the front-rear, left-right direction during operation, or when the mower 4 is moved up and down, both ends of the universal joint 21 are bent to change the connection angle between the intermediate shaft 13 and the mower shaft 19. Change and continue the rotation drive of the cutting blade 17.

Problems to be Solved by the Invention Bevel gears 18 and 20 for changing the rotation direction are necessary, and the structure is complicated.

In addition, a space for installing the universal joint 21 must be secured, and therefore, in order to reduce the turning radius of the moving vehicle 1 and the size of the moving vehicle 1, the distance between the front wheel 2 and the rear wheel 3 is greatly increased. It cannot be narrowed down to. On the other hand, front wheel 2
When the space between the rear wheel 3 and the rear wheel 3 is narrowed and the universal joint 21 is shortened, there is a drawback in that the movable size of the mower 4 becomes small due to the restriction of the angle when both ends of the universal joint 21 are bent.

Means for Solving the Problems An intermediate transmission unit for connecting a working machine to a moving vehicle so as to be able to move up and down, and providing a constant velocity joint for transmitting power to the working machine, and transmitting power from a driving unit of the moving vehicle. Is provided above the working machine, a constant velocity joint is provided in the intermediate transmission portion, a rotary shaft having a vertical axis is connected between the constant velocity joints, and the constant velocity joint of the intermediate transmission portion and the The rotary shaft was connected so that it could slide vertically.

The power from the drive unit of the moving vehicle is transmitted to the intermediate transmission unit,
Further, it is transmitted to the work machine via the constant velocity joint of the intermediate transmission portion and the rotary shaft via the constant velocity joint of the working machine. Even when the work machine moves in the front-rear, left-right direction and the rotary shaft is tilted, power transmission is continued because the rotary shaft is connected by the constant velocity joint at the vertical position, and the work machine is moved up and down. The rotary shaft slides vertically with respect to the constant velocity joint of the intermediate transmission unit.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 and 2. First, the moving vehicle 22 is automatically driven by remote control, and a mower 25, which is a working machine, is arranged between a front wheel 23 and a rear wheel 24 of the moving vehicle 22. The mower 25
Is linked to the moving vehicle 22 by a link mechanism 26 and a cylinder 27 that drives the link mechanism 26 so as to be movable up and down. An output shaft 29 protruding downward is provided in the engine 28 of the moving vehicle 22, a pulley 29a is attached to one end of the output shaft 29, and a belt 29b wound around the pulley 29a is interposed. Power is transmitted to a pulley fixed to an input shaft of a transmission (not shown), and is connected to the rear wheel 24, which is a driving wheel, via the transmission. A clutch 30 is attached to the output shaft 29, and a pulley 31 is connected to the clutch 30.

The moving vehicle 22 is provided with an intermediate transmitting portion 32 located above the working machine 25. The intermediate transmitting portion 32 includes a bracket 34 fixed to a frame 33 of the moving vehicle 22, and an inside of the bracket 34. An intermediate shaft 36 held by a bearing 35 and a pulley 37 fixed to the intermediate shaft 36.
A power transmission belt 38 is wound between the pulley 37 and the pulley 31. Further, the intermediate shaft
36 includes a constant velocity ball joint 39 which is a constant velocity joint.
And the cover 40 are fixed.

Next, the mower 25 is provided with a shaft 41 having an axial center in the vertical direction of the power input section and a cutting blade 42 fixed to the lower end of the shaft 41. A pulley 43 for transmitting power to another cutting blade (not shown) is fixed. A constant velocity ball joint 44, which is a constant velocity joint, and a cover 45 are fixed to the pulley 43. A mower shaft 46, which is a rotating shaft having a vertical axis, is spline-coupled between the constant velocity ball joint 39 and the constant velocity ball joint 44. The mower shaft 46 is the constant velocity ball joint 39.
Is vertically slidably connected to.

In such a configuration, when the engine 28 is started and the clutch 30 is engaged, the power from the engine 28 is transmitted from the output shaft 29 to the pulley 31 via the clutch 30 and further via the belt 38 to the intermediate transmission portion. Transmitted to 32. Intermediate transmission section
In 32, the pulley 37, the intermediate shaft 36, the constant velocity ball joint 39, and the mower shaft 46 rotate integrally, and the rotation of the mower shaft 46 is controlled by the constant velocity ball joint 44, the pulley 43, and the shaft 41. This is transmitted to 42, and the cutting blade 42 is rotationally driven.

Here, even when the mower shaft 46 is tilted due to movement of the mower 25 in the front-rear and left-right directions during the work, the rotation drive of the cutting blade 42 is continued by the action of the constant velocity ball joints 39 and 44. .

Further, by driving the cylinder 27, the link mechanism 26
The mower 25 is moved up and down via the mower 25, and when the mower 25 is moved up and down, the mower shaft 46 slides vertically with respect to the constant velocity ball joint 39. Therefore, the lifting and lowering drive of the mower 25 can be performed without any restriction.

As described above, the present invention connects the working machine to the moving vehicle so as to be able to move up and down, and provides the intermediate transmitting section to which the power from the drive section of the moving vehicle is transmitted, and the intermediate transmitting section. A constant-velocity joint is installed on the shaft, and a rotary shaft having a vertical axis is connected between the constant-velocity joint and the constant-velocity joint installed on the working machine. By slidably connecting in the direction, it is possible to reduce the number of parts of the power transmission device from the drive part of the moving vehicle to the working machine, and to simplify the structure. Since the installation space can be narrowed and the distance between the front wheels and the rear wheels can be narrowed, the turning radius of the moving vehicle can be reduced, and the moving vehicle can be downsized.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a longitudinal side view showing an enlarged main part, FIG. 2 is a side view showing the whole, and FIG. 3 is a conventional example. It is a side view which shows. 22 …… Mobile vehicle, 25 …… Work machine, 28 …… Drive unit, 32 ……
Intermediate transmission part, 39 …… Constant velocity joint, 44 …… Constant velocity joint, 46 …… Rotary shaft

Front page continuation (72) Inventor Hiroshi Takahashi 1-1-1 Ishishiba, Matsumoto-shi, Nagano Ishikawajima Shibaura Machinery Co., Ltd. Matsumoto factory (56) References: 63-45138 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A constant velocity joint for connecting a working machine to a moving vehicle so that the working machine can move up and down, and a power is transmitted to the working machine, and an intermediate transmission section for transmitting the power from a drive section of the moving vehicle. It is provided above the working machine and a constant velocity joint is provided in the intermediate transmission portion, a rotary shaft having a vertical axis is connected between the constant velocity joints, and the constant velocity joint of the intermediate transmission portion and the rotary shaft are connected. A power transmission device for a working machine, characterized in that and are connected slidably in the vertical direction.