JPH0348044B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a boom whose tip faces toward the front of the vehicle body so that it can be raised and lowered freely, and a boom mounted on the front side of the prime mover mounted on the rear side of the vehicle body. A relay transmission shaft is provided to which the power from the left side traveling device is transmitted using an endless band for transmission, and an input shaft for forward movement and an input shaft for reverse movement of the left side traveling device is provided, and the power from these input shafts is transmitted to the left side traveling device. It is equipped with a gear transmission device for the left traveling device that transmits power to the output shaft for the device, and an input shaft for forward movement and an input shaft for reverse movement of the right traveling device, and the power from these input shafts is transmitted to the right traveling device. The present invention relates to a transmission structure for traveling of a boom work vehicle, in which gear transmission devices for a right traveling device that transmit power to an output shaft of the vehicle are separately connected to the relay transmission shaft using belt tension clutches.

[Conventional technology]

This driving transmission structure uses the weight of the driving part on the rear side of the vehicle body as a balance weight to stabilize the front-rear balance of the vehicle body, and has a simple structure using a mechanical transmission structure, and the left and right propulsion wheels It is designed so that each can be operated forward, reverse, and stopped separately.

By the way, conventionally, as shown in FIG. 6, the gear transmission device GL for the left traveling device and the gear transmission device GR for the traveling device were housed in one transmission case 8.

Incidentally, the transmission case 8 is formed to be as small as possible in order to reduce the weight of the vehicle, and is generally arranged at the center in the width direction of the vehicle body.

[Problem that the invention seeks to solve]

According to the conventional configuration, as shown in FIG. 6, when the output shaft 13L for the left traveling device and the output shaft 13R for the right propulsion wheel are respectively used as an axle, the transmission cases of both output shafts 13L and 13R are The amount of protrusion from the output shaft 8 becomes large, and accordingly, it becomes necessary to increase the diameter of the output shafts 13L and 13R, resulting in an inconvenience that the weight of the vehicle increases.

Further, as shown in FIGS. 7 and 8, separate axles 36L and 36R are provided, and these axles 36L and 36
Even when R and both output shafts 13L, 13R are connected in a different manner by chains 37, 37 as endless transmission bands, the amount of protrusion of the output shafts 13L, 13R from the transmission case 8 becomes large. , axle 36
The lengths of L and 36R become longer, which causes the disadvantage that the weight of the vehicle increases, as described above.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to modify it so that transmission can be performed while using a small diameter shaft.

[Means for solving problems]

In the traveling transmission structure of a boom work vehicle according to the present invention, left and right transmission cases, each housing a gear transmission device for the left traveling gear and a gear transmission device for the right traveling gear, are distributed and arranged on both lateral sides of the vehicle body. Its functions and effects are as follows.

[Effect]

The output shafts provided in the left and right transmission cases can be located on both sides of the vehicle body without increasing their protrusion length from the transmission case, and even when the output shafts are used as axles, Furthermore, even when an axle that is interlocked with the output shaft is provided separately, the diameters of the output shaft and the axle can be made as small as possible. By the way, the left and right transmission cases have also been downsized,
In addition, because of such miniaturization, the wall thickness can also be reduced, and the weight does not increase due to the provision of left and right transmission cases.

〔Effect of the invention〕

Therefore, it is possible to perform the desired power transmission even though the diameter of the output shaft and axle is as small as possible, compared to conventional structures that require the use of large diameter shafts.
It has become possible to reduce the weight of the vehicle.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIGS. 1 and 2, a pair of left and right propulsion wheels 1L and 1R, each configured to be able to freely switch between forward and backward movement and stop operation, are provided on the front side of the vehicle body, and are arranged around an idler wheel 2a and a vertical axis. A caster 2 consisting of a wheel supporting frame 2b that can freely rotate is provided at the rear of the vehicle body, a boom 3 is attached to the rear of the vehicle so that it can be raised and lowered freely, and a hydraulic cylinder 4 for lifting and lowering the boom is provided. A bucket cart 5 for carrying a worker is attached to the tip of the vehicle, thereby forming an aerial work vehicle mainly used for cultivation management work such as chemical application, pruning, flower thinning, etc. and harvesting work in orchards and the like.

The boom 3 is constructed by a pair of upper and lower arms 3a and 3b connecting the boom attachment part on the vehicle body side and the worker-mounted bucket 5 to form a parallel quadruple link. The worker-mounted bucket cart 5 can be maintained in a predetermined posture regardless of whether the bucket cart 3 is raised or lowered.

Next, the transmission structure for the left and right propulsion wheels 1L and 1R will be explained based on FIGS. 1 to 3.

The engine E as a driving part mounted on the rear end of the vehicle body and the relay transmission shaft 6 disposed in front of it are
They are interlocked and connected via a power transmission belt 7 as an endless belt for power transmission. A left side transmission case 8L houses a gear transmission GL for the left propulsion wheel 1L, and a right side transmission case 8R houses a gear transmission GL for the right side propulsion wheel 1R at the front side of the relay transmission shaft 6. are distributed and arranged on both sides of the vehicle body, and these transmission cases 8
Forward input shafts 9L and 9R supported by L and 8R respectively
and the reverse input shafts 10L, 10R are connected to forward belt tension clutches 11L, 11R and reverse belt tension clutches 12L, 12R, respectively.
The output shafts 13L and 1 of the transmission cases 8L and 8R are interlocked and connected to the relay transmission shaft 6 through the
3R to left and right wheels 1L, 1R, transmission chain 1
4L and 14R are interlocked and connected, and the left and right propulsion wheels 1
It is configured such that the rotation direction of each of L and 1R can be switched separately and the driving can be stopped separately.

Reference numeral U in the figure is a hydraulic unit for the boom lifting hydraulic cylinder 4, which is interlocked and connected to the relay transmission shaft 6 using a transmission belt 15.

The gear transmission devices GL and GR will be explained.
Note that the left and right gear transmission devices GL and GR have the same configuration, and the left gear transmission device GL will be described below.

That is, the first gear 16 fixed to the forward input shaft 9L and the second gear 1 fixed to the reverse input shaft 10L.
7 in occlusal interlock, and the input shaft 10 for backward movement.
The third gear 18 fixed to L and the fourth gear 19 fixed to the output shaft 13L are interlocked to ensure that the reverse belt tension clutch 12L is in the disengaged state when the forward belt tension clutch 11L is engaged. It is configured to switch between forward and reverse rotation by transmitting the power of the forward input shaft 9L to the reverse input shaft 10L and then to the output shaft 13L.

In addition, 20L and 20R in the figure are the output shafts 13.
This is a traveling brake that acts on brake levers L and 13R, and is biased back toward the braking action side by springs 22L and 22R that act on brake operating arms 21L and 21R.

Next, the control configuration will be explained based on FIGS. 4 and 5.

The worker-mounted bucket 5 is provided with a pedal 23 for lifting and lowering the boom, and a pair of left and right traveling operation levers 24.
L and 24R are provided. Then, the pedal 2
3 and a control valve 25 provided in the hydraulic unit U.
are connected by a push-pull wire 26.

Moreover, each of the belt tension type clutches 11
Hydraulic cylinders 28L, 28R, which operate the tension arms 26L, 26R, 27L, 27R of L, 11R, 12L, 12R, respectively, to the clutch engagement side;
29L and 29R are provided, and hydraulic cylinders 30L and 30R are provided for operating the travel brakes 20L and 20R, respectively, to the brake release side.

Then, both traveling operation levers 24L, 24R
are provided with forward master cylinders 31L, 31R, which are operated by swinging forward, and reverse master cylinders 32L, 32R, which are operated by swinging backward, respectively. The pressure oil from the cylinders 31L and 31R is connected via piping to the forward clutch operation hydraulic cylinders 28L and 28R and the brake operation hydraulic cylinders 30L and 30R, and each reverse master cylinder 32
Pressure oil from L and 32R is connected to hydraulic cylinders 29L and 29R for reverse clutch operation and hydraulic cylinders 30L and 30R for brake operation, respectively, and the travel control levers 24L and 24R are moved forward from the neutral position. As the belt tension type clutches 11L and 11R for forward movement are operated toward the side, the forward belt tension type clutches 11L and 11R are operated to engage, and the travel brakes 20L and 20R are operated to release the brakes.
As L and 24R are operated rearward from the neutral position, the reverse belt tension type clutch 12
Turn on L and 12R and operate the travel brake 2.
It is configured so that 0L and 20R are operated to release the brake.

Of the left and right travel control levers 24L and 24R, the left travel control lever 24L controls the left propulsion wheel 14, and the right travel control lever 24R controls the right propulsion wheel 1R. Of course. Further, the hydraulic cylinders 30L and 30R for operating the travel brake are
It is configured in a so-called tandem type in which two pistons 31 and 32 are installed in series, and when the travel control levers 24L and 24R are operated in the forward direction, only the front piston 31 is operated.
In addition, the piping is connected so that the front and rear pistons 31 and 32 operate when the traveling operation levers 24L and 24R are operated in the reverse direction.

However, in the figure, 33 is a main frame along the longitudinal direction of the vehicle body, 34 is a boom attachment frame portion erected at the rear end of the main frame 33, and 35 is the main frame 33 of the boom attachment frame portion 34.
This is a reinforcing frame portion that connects the front end portion of the main frame 33 to a portion upwardly away from the main frame 33 . The main frame 33 is formed of pipe material into a trapezoidal shape whose width becomes smaller toward the rear end, and the engine E,
Place the left and right transmission cases 8L, 8R, etc. on the main frame 3.
It is placed and supported on a horizontal frame portion which is also constructed to serve as reinforcement in step 3.

[Another example]

The present invention can be applied not only to driving wheels but also to driving various traveling devices such as traveling crawlers, and
In addition to aerial work vehicles, it can be applied to various boom work vehicles such as crane work vehicles.

[Brief explanation of drawings]

The drawings show an embodiment of the transmission structure for traveling of a boom work vehicle according to the present invention, FIG. 1 is a schematic side view of the aerial work vehicle, FIG. 2 is a plan view of the transmission structure, and FIG. 3 is a diagram showing the transmission system. FIG. 4 is a schematic diagram showing the operating structure for traveling, and FIG. 5 is a schematic diagram showing the operating structure for raising and lowering the boom. 6 to 8 are schematic plan views showing a conventional transmission system. 1L, 1R... Traveling device, 3... Boom, 6...
...Relay transmission shaft, 7...Endless band for transmission, 8L, 8R
...Transmission case, 9L, 9R...Input shaft for forward movement, 10L, 10R...Input shaft for reverse movement, 11
L, 12L, 11R, 12R... Belt tension clutch, 13L, 13R... Output shaft, E...
Driving unit, GL, GR...gear transmission device.

Claims (1)

[Claims] 1. A boom 3 whose tip faces toward the front of the vehicle body can be freely raised and lowered, and a driving unit E is mounted on the rear side of the vehicle body.
A relay transmission shaft 6 to which the power from the driving portion E is transmitted using the endless transmission band 7 is provided at the front side of the drive unit E, and an input shaft 9L for forward movement and an input shaft 10L for reverse movement of the left traveling device 1L are provided. and a gear transmission device GL for the left traveling device that transmits power from the input shafts 9L and 10L to the output shaft 13L for the left traveling device, and an input shaft 9R for forward movement of the right traveling device 1R. A gear transmission device GR for the right side traveling device, which is equipped with an input shaft 10R for reversing and transmits the power from these input shafts 9R, 10R to an output shaft 13R for the right side traveling device, is connected to a belt tension clutch 11L, 12L, 11R, and 12R are each used to interlock and connect the relay transmission shaft 6 to the traveling transmission structure of a boom work vehicle, and the left and right transmission cases 8L accommodate the gear transmissions GL and GR separately. , 8R are distributed and arranged on both sides of the vehicle body.This is a transmission structure for traveling of a boom work vehicle.