JP2003025859A - Work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce costs by simplifying structure while providing a function to return a return oil of a continuously variable transmission to a transmission case and an oil inspecting function. SOLUTION: A hydrostatic continuously variable transmission 15 using a lubricating oil in the transmission case 10 as a hydraulic fluid is provided, and it is so constituted that a return end 24A of a hydraulic return pipe 24 from this continuously variable transmission 15 can be switched to the state inserted and connected to an oil inspecting port 20 for inspecting an amount of the lubricating oil in the transmission case 10 so that the return oil is discharged into the transmission case 10 or to the pulled-out and separated state, and an inspection part 24a is formed at this return end 24A for detecting the amount of the lubricating oil in the state inserted and connected to the oil inspecting port 20.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a working machine such as a rice transplanter.

[0002]

2. Description of the Related Art A work machine is known in which a hydrostatic stepless transmission, which uses lubricating oil in a transmission case as working oil, is provided as a transmission. In such a working machine, it is necessary to return hydraulic pressure from the continuously variable transmission to the mission case. On the other hand, in the working machine, it is necessary to detect the amount of lubricating oil in the mission case and manage it properly.

In order to satisfy the above requirements, in the prior art, the return end of the hydraulic return pipe from the continuously variable transmission is connected to the mission case so as to discharge the return oil into the mission case, while the return case is connected to the mission case. An oil detection hole was formed, and an oil detection rod that could be inserted into and removed from it was provided.

Further, in the working machine, it is necessary for the mission case to have a blazer function, and conventionally, a blazer pipe connected to the mission case was erected.

Further, in the working machine, a transmission clutch body is rotatably mounted on one end side of an output shaft to the working machine, and is meshed with the transmission clutch body by moving along the axial direction of the output shaft. The passive clutch body that can be switched between the interlocked clutch engagement position and the clutch disengagement position that releases the interlocking movement is mounted in a state of integrally rotating, and a spring for urging the passive clutch body to move to the clutch engagement position is provided, and the output shaft When a load more than the setting is applied, the passive clutch body may be moved to the clutch disengaged position against the biasing force of the spring to form a jump clutch that cuts off the transmission. When installing such a jump clutch in the mission case, the output shaft, transmission clutch body, passive clutch body, and spring are assembled in advance, and the assembly form that incorporates this pre-assembly into the mission case is adopted in terms of workability. It is often done. In such a case, it is necessary to prevent the transmission clutch body from slipping off from the output shaft until the pre-assembled product is assembled in the mission case. In order to prevent such disengagement, conventionally, a retaining ring that prevents the transmission clutch body from coming off by abutting against the axial end surface of the transmission clutch body is elastically fitted to the output shaft in a state in which axial movement is restricted. Was there.

[0006]

However, the above-mentioned conventional techniques have the following drawbacks. When connecting the hydraulic return pipe to the mission case to return the return oil from the continuously variable transmission to the mission case, form the oil inspection hole in the mission case, and install the oil inspection rod to detect oil. Requires two structures, a hydraulic return pipe connection structure and an oil detection structure, resulting in an increase in cost.

When the blazer pipe is erected and the mission case has a blazer function, the lubricating oil may leak through the blazer pipe without good gas-liquid separation.

When the retaining ring elastically fitted to the output shaft is held against the end surface of the transmitting clutch body to prevent the transmitting clutch body from slipping off, there is no restriction on the radial expansion deformation of the retaining ring. After the assembly, the retaining ring may come off the output shaft due to the thrust force, etc., and fall into the mission case.

An object of the present invention is to eliminate the above-mentioned conventional drawbacks.

[0010]

The features, functions and effects of the working machine according to the present invention according to claim 1 are as follows.

[Features] A hydrostatic stepless transmission that uses lubricating oil in the mission case as a hydraulic oil is provided, and the return end portion of the hydraulic return pipe from the stepless transmission is returned to the mission case. It is configured to be switchable between a state of being inserted and connected to an oil detecting port for detecting the amount of lubricating oil of the mission case so as to be discharged inside and a state of being withdrawn and withdrawn.
A point for detecting the amount of lubricating oil in the state of insertion connection to the oil detecting port is formed at this return end.

[Operation] While the return end of the hydraulic return pipe is configured to be freely inserted into and removed from the oil detection port formed in the transmission case, a detection unit is formed at this return end to detect the return end. Since it is also configured as a rod, the connection of the hydraulic return pipe to the mission case and the oil detection can be performed with one structure.

[Effect] Therefore, it is possible to reduce the cost by simplifying the structure while having the function of returning the return oil of the continuously variable transmission to the transmission case and the oil detecting function.

The features, functions and effects of the working machine according to the present invention according to claim 2 are as follows.

[Characteristics] A stay for connecting a gas-liquid separator having a blazer hole formed therein to an end of a blazer pipe connected to a mission case and supporting the end of the blazer pipe in an upward posture is The point is that the amount of insertion into the end of the blazer pipe of the gas-liquid separator is regulated.

[Operation] Since the gas-liquid separator is inserted and connected to the end of the blazer pipe, the gas-liquid separation performance can be improved. Moreover, since the amount of insertion of the gas-liquid separator is regulated by contact with the indispensable stay that supports the blazer pipe, a member for regulating the amount of insertion of the gas-liquid separator is unnecessary.

[Effect] Therefore, the improvement of the lubricating oil leakage prevention function by the improvement of the gas-liquid separation performance can be achieved with a simple structure and at a low cost.

The features, functions, and effects of the working machine according to the present invention of claim 3 are as follows.

[Characteristics] A clutch which is rotatably mounted on one end side of an output shaft to a working device, and which meshes with and interlocks with the output clutch by moving along the axial direction of the output shaft. The passive clutch body, which can be switched between the engaged position and the clutch disengaged position to release the interlocking movement, is mounted in a state of integrally rotating, and a spring for urging the passive clutch body to move to the clutch engaged position is provided, and the output shaft is set above When a load is applied, the passive clutch body is moved to the clutch disengaged position against the biasing force of the spring to form a jump clutch that cuts off the transmission, and the transmission clutch body is prevented from coming off from the output shaft. A retaining ring that prevents the transmission clutch body from coming off by abutting on the clutch body is elastically fitted to the output shaft in a state where the movement of the clutch is restricted in the axial direction. Lies in that is integrally formed enlarged diameter deformation preventing portion for abutment prevents expanded deformation of the retaining ring to the transmission clutch body is.

[Operation] Since the expansion ring deformation preventing portion integrally formed with the transmission clutch body is arranged on the outer periphery of the snap ring elastically fitted to the output shaft, the expansion ring deformation of the snap ring is prevented. , It is now possible to prevent the snap ring from coming off the output shaft with a simple modification to the transmission clutch body without providing a special tool for preventing the diameter expansion deformation.

[Effect] Therefore, the retaining ring can be prevented from falling off with a simple structure and at a low cost.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIGS. 1 and 2, a rice transplanter, which is an example of a working machine, has a seedling planting device 2 which is an example of a working device at the rear of a riding type self-propelled machine 1. The seedling planting device 2 which is vertically movable through a link mechanism 3 and is connected with the pressure oil supply.
And a lift cylinder 4 using a hydraulic cylinder that raises the seedling planting device 2 by its own weight as the oil is drained.

The self-propelled machine 1 is, as shown in FIG.
A pair of left and right driving front wheels 5 for steering and a pair of left and right driving rear wheels 6
The engine 7 is mounted on the front part of the airframe with
A driver's seat 8 is mounted on the rear part of the body frame.

The body frame is, as shown in FIG.
To the front part of the main frame 9 having a structure in which the left and right frame members are connected, a mission case 10 in which a traveling mechanism (driving front wheel 5 and driving rear wheel 6) and a transmission mechanism to the seedling planting device 2 are connected is connected, An engine mounting frame 11 is connected to the front portion of the mission case 10.

The drive front wheels 5 are supported by the mission case 10 via a front axle case 12, and the drive rear wheels 6 are attached to the main frame 9 by the rear axle case 1.
It is supported through 3.

As shown in FIG. 4, FIG. 6 and FIG. 8, the engine 7 is provided on the left and right sides of the mission case 10.
Main clutch 14 using belt tension clutch
A hydrostatic continuously variable transmission 15 that is switchable between forward and backward movement is driven through the transmission case 10 and is mounted in the transmission case 10 in a state of outputting. In addition, the mission case 10
As shown in FIG. 4, an auxiliary transmission device 16 capable of switching the output of the continuously variable transmission device 15 between high and low stages, and a transmission shaft 17 for transmitting the output of the auxiliary transmission device 16 to a traveling portion are provided therein.
And a front wheel diff 18 which can be differentially locked with respect to the drive front wheel 5, and a jump clutch 19 which cuts off transmission to the seedling planting device 2 when a load larger than a set value acts on the seedling planting device 2.
And are provided.

As shown in FIGS. 8 and 9, the top plate of the mission case 10 has the mission case 10 as shown in FIG.
An oil detecting port 20 for detecting the amount of lubricating oil therein is formed so as to also serve as an oil supplying port.

On the top plate, as shown in FIGS. 7 and 8, the blazer pipe 2 is connected to the inside of the mission case 10 to let the air escape to the outside of the mission case 10.
1 is arranged in an elbow shape, and an end portion of the blazer pipe 21 is supported in an upward posture by a stay 22 attached to the mission case 10 with a bolt. Further, a container-shaped gas-liquid separator 23 having a blazer hole 23a formed at the upper end is inserted and connected to the upward end of the blazer pipe 21.
The lower end of the member 3 is in contact with the stay 22 to restrict the downward movement of the blazer pipe 21, that is, the amount of insertion into the upward end. In other words, the stay 22 serves as a restricting tool that restricts the amount of the gas-liquid separator 23 inserted into the upward end portion.

The continuously variable transmission 15 uses the lubricating oil in the transmission case 10 as operating oil, and as shown in FIGS. 6 to 8, the hydraulic return pipe from the continuously variable transmission 15 is used. Reference numeral 24 is made of rubber that is elastically deformable. The return end 2 of the hydraulic return pipe 24
As shown in FIG. 9, 4A is an elastic deformation of the hydraulic return pipe 24 itself in a state in which the return oil is inserted and connected to the oil detecting port 20 so as to be discharged into the mission case 10 and a state in which the hydraulic oil return pipe 24 is withdrawn and withdrawn. The return end portion 24A is configured to be switchable, and a detection portion 24a for detecting the amount of lubricating oil in a state of being inserted and connected to the oil detection port 20 is formed. The detection unit 24a has two bulging portions L for the lowest level index and the highest level index, which are vertically spaced from each other.
It is formed by forming H. That is, the return end portion 24A also serves as an oil dip stick. Furthermore, the return end 2
4A has a stopper portion 25 that also serves as a knob operating portion that regulates the insertion into the oil detecting opening 20 by abutting on the peripheral portion of the oil detecting opening 20 of the top plate, and closes the oil detecting opening 20 in the insertion connected state. The plug portion 26 is formed integrally.

The jump clutch 19 is, as shown in detail in FIG. 5, an output shaft 15a of the continuously variable transmission 15.
A transmission clutch body 29, which is interlocked with a transmission shaft S geared to (the input shaft of the auxiliary transmission device 16) via bevel gears 27 and 28, is supported by the transmission case 10 via a bearing 30 so as to be rotatable only. An output shaft 31 to the planting device 2 is rotatably supported by the transmission clutch body 29 and a bearing 32, and the output shaft 31 is interlocked with the transmission clutch body 29 by moving in the axial direction. A passive clutch body 33 that can be switched between a clutch engaged position and a clutch disengaged position that releases the interlock is mounted in a state of integrally rotating, and a spring 34 for urging the passive clutch body 33 to move to the clutch engaged position is provided. Has been done.

The jump clutch 19 includes an output shaft 31, a transmission clutch body 29, a passive clutch body 33,
The spring 34 is assembled in advance, and the assembly is incorporated into the mission case 10 by incorporating the assembly into the mission case 10. The means for preventing the transmission clutch body 29 from coming off from the output shaft 31 in the preassembled state is as follows. , A stop ring 37 for preventing the transmission clutch body 29 from coming off by coming into contact with a step portion 35 formed on the inner peripheral surface of the boss portion of the transmission clutch body 29 via a thrust collar 36, and the output shaft 31 is restricted in movement in the axial direction. The diametrical expansion preventing portion 38, which is located on the outer circumference of the retaining ring 37 and is elastically fitted to the diametrically extending boss of the transmission clutch body 29 to prevent the diametrical expansion deformation of the retaining ring 37 from abutting on the transmission clutch body. 29, and is integrally formed. In addition, between the transmission clutch body 29 and the output shaft 31, the transmission clutch body 29 is moved in the axial direction with respect to the output shaft 31, and the retaining ring mounting portion of the output shaft 31 is attached to the transmission clutch body 29. The boss portion, that is, the diameter expansion deformation prevention portion 38
The output shaft 31 of the retaining ring 37
A flexible U is formed to allow elastic fitting to the.

In front of the driver's seat 8, there is a steering handle 39 for steering the front drive front wheels 5.
Main transmission lever 4 for operating the continuously variable transmission 15
0 and an auxiliary transmission lever 41 for operating the auxiliary transmission device 16 are arranged.

Further, as shown in FIG. 10, a portion 42a of the rear bonnet 42 that covers the rear portion of the engine 7 and corresponds to the hydraulic return pipe 24 is a hydraulic return pipe 2.
4 is formed so as to bulge so as to form a groove for passing therethrough. Of course, the oil test can be performed with the rear bonnet 42 removed.

[Brief description of drawings]

[Figure 1] Side view of rice transplanter

[Figure 2] Plan view of rice transplanter

[Figure 3] Side view of the main part of rice transplanter

FIG. 4 is a sectional view of the mission case.

FIG. 5 is a sectional view of the jump clutch.

FIG. 6 is a left side view of the mission case

[Figure 7] Left side view of the mission case

FIG. 8 is a cutaway rear view of the mission case.

FIG. 9 is a sectional view showing a state in which the return end is pulled out from the oil inspection port.

FIG. 10 is a cross-sectional plan view of the main part of the rear bonnet.

[Explanation of symbols]

10 mission case 15 continuously variable transmission 24 Hydraulic return pipe 24A Return end 20 Oil test mouth 24a detector 21 Blazer pipe 23a Blazer hole 23 Gas-liquid separator 22 stay 29 Transmission clutch body 31 Output shaft 33 Passive clutch body 34 Spring 37 retaining ring 38 Expanding deformation prevention part

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F16H 57/02 303 F16H 57/02 303C 57/04 57/04 EF term (reference) 2B062 AA01 AB01 BA07 BA18 3D042 AA05 AA06 AB11 BA02 BA18 BA19 BB05 3D043 AB11 BC13 3J056 AA02 AA63 BD23 BD35 BE01 GA02 GA22 3J063 AA13 AB02 AB54 AC06 BA04 BB19 XE33 XG16 XG51

Claims (3)

[Claims] 1. A hydrostatic stepless transmission that uses lubricating oil in the mission case as hydraulic oil is provided, and a return end of a hydraulic return pipe from the stepless transmission is returned to the mission case. The transmission case is configured so that it can be inserted into and connected to the oil detection port for detecting the amount of lubricating oil in the transmission case, and can be withdrawn and removed from the oil detection port. A work machine that has a detection unit for detecting the amount of lubricating oil in the inserted and connected state. 2. A stay for supporting an end portion of the blazer pipe in an upward posture by connecting a gas-liquid separator in which a blazer hole is formed to an end portion of the blazer pipe connected to the mission case. A work machine installed to regulate the amount of liquid separator inserted into the end of the blazer pipe. 3. A clutch-engaging device in which a transmission clutch body is rotatably mounted on one end side of an output shaft of a work device, and the output shaft is engaged with and interlocks with the transmission clutch body by moving in the axial direction. A passive clutch body that can be switched between the position and the clutch disengaged position that releases the interlocking is installed in a state of integrally rotating, and a spring that urges the passive clutch body to move to the clutch engaged position is provided, and the output shaft is set above the When a load acts, the passive clutch body is moved to the clutch disengaged position against the urging force of the spring to form a jump clutch that cuts off the transmission, and in order to prevent the transmission clutch body from slipping off from the output shaft, the transmission clutch A retaining ring that prevents the transmission clutch from slipping off by contacting the body is elastically fitted to the output shaft in a state where axial movement is restricted, and the retaining ring is positioned on the outer circumference of the retaining ring. A working machine in which a diametrical expansion deformation preventing portion for preventing a diametrical expansion deformation of a female ring is formed integrally with the transmission clutch body.