JPH10288150A - Pump driving part structure of working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the width dimension of the output shaft direction of an engine by mounting a hydraulic pump on one side part of a transmission case and inserting/passing a pump drive shaft which interlocks with the hydraulic pump at one end and interlocks with the output shaft of an engine at the other end into/through this transmission case. SOLUTION: A self-advancing machine body of a rice transplanter for riding is provided with a machine body frame provided with a transmission case 8 journalling a pair of left and right front wheels and an axle shaft case journalling a pair of left and right rear wheels. The transmission case 8 is arranged at its attitude in which the input shaft 8a is turned to left and right directions and is projected in one of the left and right directions. An engine 15 is arranged at its attitude in which the output shaft 15a is turned to the left and right directions and is projected in one of the left and right directions. A hydraulic pump 90 is mounted on the side opposite to the projecting direction side of the input shaft 8a. A pump drive shaft 92 is provided by being inserted and passed into/through the transmission case 8 to drive the hydraulic pump 90 and this pump drive shaft 92 is linked with the output shaft 15a via a belt transmission device 91.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for driving a hydraulic pump for generating hydraulic oil to be supplied to a hydraulic cylinder for raising and lowering a seedling planting apparatus, that is, a hydraulic pump driving portion structure of a working machine.

[0002]

2. Description of the Related Art Conventionally, a hydraulic pump is arranged outside a flywheel attached to an end of an output shaft of an engine opposite to a transmission side and supported by the engine, and a drive shaft of the hydraulic pump is connected to the output shaft. To drive the hydraulic pump.

[0003]

However, according to the prior art, an output pulley or the like is provided on the transmission side of the output shaft, and the flywheel and the hydraulic pump are output on the side opposite to the transmission side of the engine. Since they are attached so as to overlap in the axial direction of the shaft, the width of the engine in the axial direction of the output shaft is large. This means that, in a small riding rice transplanter, when the engine is mounted so that the output shaft is oriented left and right, the left and right width of the driving unit becomes large. As a result, the front side of the engine is provided with a front step for getting on and off the driver's section from the front, and the aircraft is positioned so that the front of the aircraft is aligned with the ridge, so that it can get on and off without entering the field. If it is possible to do so, the width at the left and right of the previous step is reduced to reduce the getting on and off.

An object of the present invention is to reduce the width of the engine in the direction of the axis of the output shaft while providing a hydraulic pump.

[0005]

The features, functions and effects of the first aspect of the present invention are as follows.

[Characteristics] A hydraulic pump is mounted on one side of a transmission case on which an engine is mounted, and a pump drive is connected to the transmission case at one end and linked to the output shaft of the engine at the other end. The point is that the shaft is inserted.

[Operation] In the first aspect of the present invention, since the hydraulic pump is mounted on the transmission case, it is possible to reduce the width of the engine in the direction of the axis of the output shaft by an amount corresponding to the hydraulic pump. it can.

Further, the hydraulic pump is mounted on one side of a transmission case, and a pump drive shaft which is interlocked with the hydraulic pump at one end and is interlocked with the output shaft of the engine at the other end is inserted into the transmission case. Is driven by the engine, for example,
Compared to a case where the hydraulic pump is mounted on the other side of the transmission case and driven by the output shaft, the projecting amount of the other end of the output shaft from the engine is reduced, and the width of the engine in the axial direction of the output shaft is reduced. Can be reduced.

According to the first aspect of the present invention, when the engine is mounted on the small-sized riding type rice transplanter such that the output shaft is oriented in the left-right direction, the passenger can get on and off the side of the engine. When the previous step is installed, the left and right width of the previous step can be increased, and the getting on and off property can be improved.

According to the second aspect of the present invention, the features, actions,
The effects are as follows.

[Features] In the features of the first invention,
A drive shaft insertion portion through which the pump drive shaft is inserted is formed integrally with the transmission case independently of the transmission chamber.

[Operation] According to the second aspect of the present invention, the drive shaft insertion portion formed integrally with the transmission case is independent of the transmission chamber. In addition, there is no need to worry about leakage of lubricating oil in the transmission chamber due to insertion of the pump drive shaft, and a special seal structure is not required.

[Effects] Therefore, according to the second aspect of the present invention, it is possible to implement the structure simply and inexpensively, while adopting a form in which the pump drive shaft is inserted into the transmission case.

According to the third aspect of the present invention, the features, actions,
The effects are as follows.

[Features] In the features of the first and second aspects of the present invention, the engine is mounted on a transmission case via a vibration isolator.

[Operation] When an engine is mounted on an anti-vibration device and a hydraulic pump is mounted on the engine as in the prior art, a hydraulic pipe for connecting the hydraulic pump to a transmission case or a hydraulic cylinder is provided as an engine, which is caused by engine vibration. A structure that can absorb the relative displacement between the hydraulic cylinder and the transmission case is required.

Focusing on the above point and the point where the hydraulic pump is mounted on the transmission case, according to the third invention,
Since the engine is mounted on the transmission case via a vibration isolator, the above-mentioned hydraulic piping is used to connect the hydraulic pump to the transmission case and hydraulic cylinder, etc. It is not necessary to have a structure for absorbing the relative displacement.

[Effects] Therefore, according to the third aspect of the present invention, the hydraulic piping can be configured simply and inexpensively while the engine is mounted on the vibration isolator.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A riding type rice transplanter, which is a paddy working machine as an example of a working machine, has a seedling rest 3A at the rear of a riding type self-propelled body 1 as shown in FIG. The seedling planting device 3 is connected via a link mechanism 2 so as to be able to move up and down, and a hydraulic cylinder 4 for driving and raising and lowering the seedling planting device 3 is provided.

As shown in FIGS. 2 and 3, the self-propelled body 1 has a transmission case 8 supporting a pair of left and right front wheels 7.
A front step 9 made of metal (such as iron) is connected to a front portion of a body frame 6 provided with an axle case 5A pivotally supporting a pair of left and right rear wheels 5 in a cantilever shape facing forward. 9 has a frame structure in which the front side of the transmission case 9 and the front of the transmission case 8 are connected by a connection frame 10 which also serves as a support frame for the battery 80. The front wheels 7 are steering drive wheels, and the rear wheels 5 are drive wheels.

The body frame 6 is shown in FIGS.
As shown in FIG. 5, a pair of left and right main frame members 6A in a front-rear direction, a pair of left and right side frame members 6B located on the left and right sides thereof, and left and right connecting the front ends of the main frame member 6A and the side frame members 6B. The front frame member 6C has an orientation posture, and a rear end portion of the side frame member 6B is formed as a connecting portion 6a which is bent inward to be connected to the main frame member 6A. The main frame member 6A and the side frame member 6B are also connected by supporting frames 62 and 63 for supporting the pair of right and left steps 61 on the main frame member 6A and the side frame member 6B.

Then, a driver's seat 11, a steering handle 12,
At the front of the operation unit having the operation step 13, the driving unit 1
4 is provided, and the engine 1 which is the main
The mounting structure of No. 5 is as follows. As shown in FIGS. 2, 3, and 5, the engine 15 is mounted and fixed on an engine mounting base 15A, and a front portion of the engine mounting base 15A is connected to the connection frame 10 via a vibration isolator 50 using a rubber plate. The transmission case 8 is configured to support the rear portion of the engine mounting base 15A via the rubber vibration isolator 51.

The transmission case 8 has an input shaft 8
The engine 15 is arranged in a posture in which the output shaft 15a projects left or right in the left-right direction.

From the engine 15 to the transmission case 8
2, 3, 5, and 6, two belt tension clutches 53H and 53L provided over the projecting portions of the output shaft 15a and the input shaft 8a and having different transmission ratios. Means for providing a first sub-transmission 53 capable of two-speed shifting by selectively engaging the first and second gears.
The transmission of the power of the engine 15 is transmitted to the transmission case 8 by turning on the H and 53L, and the transmission is stopped by turning off both the belt tension clutches 53H and 53L.

The front step 9 is for getting on and off for getting on the vehicle from the front, and is located on both left and right sides of the driving unit 14 as shown in FIGS. 1, 2, 3 and 9. It comprises a left and right stepping portion 9A for getting on and off, a front step portion 9B located in front of the driving portion 14, and a rear step portion 9C forming a part of the front portion of the driving step 13. And
The front step 9 has a structure in which the left and right stepping steps 9A are connected at the front by a front step 9B and at the rear by a rear step 9C.
An opening 16 through which the engine 15 mounted on the transmission case 8 is inserted is independently formed in a hollow structure.

As shown in FIGS. 1, 2 and 9, the driving portion 14 is covered with an engine hood 17 made of a synthetic resin disposed on the opening 16 of the front step 9. The bonnet 17 has an upper cover 17.
a, a rear cover portion 17b, and a front cover portion 17c that can swing and open freely.

A rear cover 18 made of synthetic resin is mounted on the body frame 6.
The right and left rear wheel fender portions 18A as shown in FIG.
And a connecting plate portion 18B for connecting them and the rear step portion 9C to form an operation step portion 1 forming an operation step 13
8C, and the driver's seat 11 is supported by the connecting plate 18B. As shown in FIGS. 1 and 8, the rear cover 18 is attached to the body frame 6 so as to be swingable up and down around the rear portion X1, and can be opened upward beyond the steering handle 12. Have been. Specifically, as shown in FIG. 9, the driving step is formed by forming a concave portion 30 at the middle in the left and right direction at the front end edge of the driving step portion 18C, which is large enough to allow the steering handle 12 to pass along with the upward swing. The step portion 18C is configured to swing from the falling closed posture forming a part of the driving step 13 to the standing open posture in which the center of gravity G is located behind the swing center X1 beyond the steering handle 12 beyond the steering handle 12. I have.

As shown in FIG. 8, the means for attaching the rear cover 18 to the body frame 6 so as to be able to swing up and down around the center X1 is provided by supporting brackets 54 and 55 fixed to the left and right connecting portions 6a and the rear cover 18. This is means for connecting with a bolt 56 and a nut 57 which also serves as a shaft.

As shown in FIG. 1, the means for holding the rear cover 18 in the upright and open position is configured to receive and support the driver's seat 11 at the upper end of the seedling rest 3A of the lowered seedling planting device 3. It is a means to support by leaning.

As shown in FIGS. 3 and 8, the means for fixing the rear cover 18 in the upright closed position is as follows.
A pair of left and right hooks 59 are attached to the bracket 8, and the hook 59 is detachably engaged with the bracket 59 fixed to the side frame member 6B in a state in which the rear cover 18 is in the lying-down closed posture. This is a means for attaching a buckle 60 for holding and pressing the rear cover 18 against the body frame 6 by holding.

The rear step 9C of the front step 9 is formed in a convex shape that enters the recess 30 of the rear cover 18 in the lying closed position and forms the operation step 13 with the operation step 18C. I have.

As shown in FIG. 2 and FIG.
A traveling clutch pedal 21a projecting upward through an opening 20a is disposed at a rear portion of one of the left and right stepping steps 9A of the front feet, and an opening 20b is formed at the other left and right stepping step 9A. A pair of left and right steering clutch / brake pedals 21b projecting upward through the rear step portion 9C are provided with a front wheel differential lock pedal 21c and an auxiliary transmission operation lever 21d projecting upward through openings 20c and 20d, respectively. ing.

The traveling clutch pedal 21a is for disengaging both belt tension clutches by depressing operation.

The steering clutch brake pedal 21b
Sets the clutch / brake (not shown) for the left and right rear wheels 5 to the clutch disengaged state by a two-step depression operation;
The brakes are sequentially operated in the state of the brake operation by releasing the clutch.

The differential lock pedal 21c operates a differential lock device (not shown) for the front wheels 7 in the transmission case 8 by depressing operation.

The sub-transmission operation lever 21d is operable in the left-right direction, and is located at a very low speed position, so that the second sub-transmission device (not shown) in the transmission case 8 can be moved. Switching to the low-speed transmission state, switching the second sub-transmission to the medium-speed transmission state by being located at the medium-speed position, and switching to the high-speed transmission state by being located at the high-speed position, The second auxiliary transmission is switched to the non-transmission state by being located at a neutral position between the intermediate speed position and the intermediate speed position and between the intermediate speed position and the high speed position.

On the rear step portion 9C, a lever guard 36 for the auxiliary speed change operation lever 21d is provided. The lever guard 36 is configured by raising a portion of the rear step portion 9C near the sub-shift operation lever 21d, and allows the sub-shift operation lever 21d to pass therethrough so that the sub-shift operation lever 21d
The lever also serves as a lever guide that guides the operation of. That is, the opening 20c through which the sub-transmission operation lever 21d is inserted is formed at a portion one step higher than the upper surface of the operation step 13.

As shown in FIGS. 5 and 6, a hydraulic pump 90 for the hydraulic cylinder 4 or the like is mounted on one side of the transmission case 8 (the side opposite to the side of the input shaft 8a in the projecting direction). Have been.

The driving means of the hydraulic pump 90 is shown in FIG.
As shown in FIG. 3, means for inserting a pump drive shaft 92 interlocked with the hydraulic pump 90 at one end and the output shaft 15 a at the other end via a belt transmission 91 into the transmission case 8, As shown in FIG. 4, the pump drive shaft 92 includes a drive shaft insertion portion 93 formed integrally with the transmission case 8 independently of the transmission chamber 8 </ b> A in which a transmission mechanism (not shown) is installed. , And rotatably supported by the transmission case 8 via a pair of left and right bearings 94. 95
Is an oil filter that takes out and filters the lubricating oil in the transmission chamber 8A as hydraulic oil and supplies the filtered hydraulic oil to a hydraulic pump 90 via a pipe 96. Reference numeral 97 denotes a belt transmission 91 And a tension wheel for applying tension to the belt, and is attached to the engine 15 via a stay 98 so as to be freely changeable in position in the tension adjusting direction.

The transmission mechanism comprises the second auxiliary transmission, which is provided between the input shaft 8a and the two shafts S2,
And the main transmission configured between the main transmission and the back shaft BS,
It has an inter-stock transmission for the seedling planting device 3 formed between the two shafts 2 and the planting shaft SU, a differential for the front wheel 7, etc., and 99 is an axle for the rear wheel 5 interlocked with the differential ring gear 100. A power take-off shaft for the case 5A,
Reference numeral 101 denotes a power take-out shaft for a seedling plant that takes out power from the inter-stock transmission.

[Alternative Embodiment] In the above embodiment, the engine 15 is mounted via the vibration isolator 50, 51, but may be mounted without using the vibration isolator 50, 51.

In the above embodiment, the pump drive shaft 92 is provided in the drive shaft insertion portion 93 independent of the transmission chamber 8A. However, the pump drive shaft 92 may be provided so as to pass through the transmission chamber 8A. .

[Brief description of the drawings]

FIG. 1 is an overall side view.

FIG. 2 is a cutaway side view of the front part.

FIG. 3 is a cutaway plan view of the front part.

FIG. 4 is a longitudinal sectional side view of a transmission case.

FIG. 5 is a plan view around a transmission case.

FIG. 6 is a cutaway front view showing a hydraulic pump drive system.

FIG. 7 is a rear view of the body frame.

FIG. 8 is a perspective view of a rear cover.

FIG. 9 is a perspective view of a front part.

[Explanation of symbols]

 8 Transmission Case 15 Engine 15a Output Shaft 51 Vibration Isolator 90 Hydraulic Pump 92 Pump Drive Shaft 93 Drive Shaft Insertion Section 8A Transmission Chamber

Claims (3)

[Claims] 1. A hydraulic pump is mounted on one side of a transmission case on which an engine is mounted, and a pump drive shaft is mounted on the transmission case at one end in conjunction with the hydraulic pump and on the other end with an output shaft of the engine. Hydraulic pump drive section structure of the working machine through which is inserted. 2. The hydraulic pump drive unit structure for a working machine according to claim 1, wherein a drive shaft insertion portion through which the pump drive shaft is inserted is formed integrally with the transmission case independently of the transmission chamber. 3. The hydraulic pump drive unit structure for a working machine according to claim 1, wherein the engine is mounted on a transmission case via a vibration isolator.