JPS6113802Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is a traveling working vehicle in which the transmission case housing the speed change transmission mechanism is also used as an oil tank. An oil supply device is configured to form a strainer storage chamber communicating with the oil surface in the transmission case at a position, and to purify the oil with the oil strainer installed in the strainer storage chamber and guide it toward the hydraulic pump. , it is related to.

Conventional technology and its problems It is a commonly used technology to make the transmission case double as an oil tank in mobile work vehicles. Oil strainers for cleaning the oil introduced by the suction of the pump are generally arranged in the transmission case below the oil level.

However, there are cases where it is difficult to place an oil strainer below the oil level in the transmission case due to restrictions due to the transmission mechanism built into the transmission case, or where it is difficult to install an oil supply path from the oil strainer to the hydraulic pump. In some cases, it is convenient to install an oil strainer at a higher position, and for this reason, the applicant of this application first installed a strainer in the transmission case at a position above the oil level that communicates with the oil level below the oil level in the transmission case. proposed an oil supply system in which a strainer storage chamber is formed, and the oil is purified by an oil strainer installed in the strainer storage chamber and guided toward a hydraulic pump (Jitsuganesho).
50-92341).

As shown in FIGS. 4-6, the oil supply device according to this prior application has an oil intake that opens below the oil level at the lower end on the joint surface of both case halves 70a and 70b of a mission case 70 that is divided into two. A strainer storage chamber 72 is formed in the transmission case 70 at a position above the oil level, and an oil strainer storage chamber 72 is formed in the transmission case 70 at a position above the oil level. 73 is provided. Mission case 7
A plate 74 for forming an oil passage with the outer surface of the transmission case 70 is mounted on the outer surface of one side of the transmission case 0, and a hydraulic pump 75 is mounted on the outer surface of the plate 74. On the other hand, the oil purified by the oil strainer 73 is sent to the hydraulic pump 7.
A pump-side oil passage 76 leading in five directions is formed between the outer surface of the mission case 70 and the inner surface of the plate 74. In FIGS. 4-6, 77 is a large number of fins protruding from the outer surfaces of the joints of both case halves 70a and 70b, which are useful for cooling the oil flowing through the oil intake passage 71.

In the oil supply device shown in FIGS. 4-6, an oil intake passage 71 that guides oil from below the oil level in the mission case 70 to an upper strainer storage chamber 72 connects the joint surface of both case halves 70a and 70b. Since the oil intake passage 71 and the strainer accommodation chamber 72 are formed using the two case halves 70a and 70b, it is easy to form the oil intake passage 71 and the strainer accommodation chamber 72. However, on the other hand, it cannot be denied that it has the following problems.

That is, the oil intake passage 71 formed on the joint surface of both case halves 70a and 70b opens into the strainer housing chamber 72 at a central position in the longitudinal direction of the housing chamber 72. Therefore, oil mainly flows in the strainer storage chamber 72 as shown by the arrow in FIG. 6 from the open end position of the oil intake path 71 toward the pump side oil path 76 when viewed in the longitudinal direction of the storage chamber 72 and the oil strainer 73. As a result, oil tends to stay in the strainer storage chamber portion A located on the opposite side of the pump-side oil passage 76. The oil that remains in this manner is likely to deteriorate, and if a portion of the deteriorated oil is supplied to the hydraulic pump 75 through the oil strainer 73 and the pump-side oil passage 76, there is a risk that the pump will malfunction. Further, since oil is supplied to the oil strainer 73 from a position midway in the longitudinal direction of the strainer 73, the excess area of the oil strainer 73 is not fully utilized.

Therefore, this invention improves the oil supply device shown in Fig. 4-6 while taking advantage of the advantage that it is easy to form an oil suction chamber above the oil level, and improves the oil supply system shown in Fig. 4-6. It is an object of the present invention to provide a novel oil supply device for a traveling work vehicle, which eliminates the accumulation of oil and also achieves this by fully utilizing the excess area of the oil strainer.

Technical means for solving the problem In order to solve the problem of this invention, this invention took the following technical means.

That is, as illustrated in FIG. 1, the oil supply device of this invention is used in a traveling working vehicle in which the transmission case 3 housing the speed change transmission mechanism is also used as an oil tank. A strainer storage chamber 18 is formed at a position above the oil level in the transmission case 3 and communicated with the oil surface, and an oil strainer 22 provided in this strainer storage chamber 18 cleans the oil and guides it toward the hydraulic pump. The oil supply device is configured such that the strainer storage chamber 18 is placed inside the mission case 3 and facing case walls 3a and 3b of the mission case 3 are provided.
At the same time, an oil intake passage 21 communicating below the oil level in the transmission case 3 is formed at one longitudinal end of the strainer storage chamber 18, and a pump side oil passage 20, 25 is formed at the other end. are characterized in that they are communicated with each other.

In other words, this invention allows oil to flow from the oil intake passage 21 from one end to the other end of the strainer storage chamber 18 formed across the opposing walls 3a and 3b of the mission case 3, and an oil strainer is placed in the middle of the flow. 22 to be sent to the hydraulic pump, eliminating the accumulation of oil in the strainer housing chamber 18, and supplying oil to substantially the entire circumferential surface of the oil strainer 22 to sufficiently fill the over area of the strainer. Use it. The strainer housing chamber 18 formed across the opposing case walls 3a and 3b can be formed simultaneously when the mission case 3 is cast.

Embodiment FIG. 2 shows an agricultural tractor equipped with an embodiment of the present invention, and FIGS. 1 and 3 respectively show an agricultural tractor equipped with an embodiment of the present invention.
The main parts of the tractor are illustrated.

The illustrated agricultural tractor has an engine 1 mounted on the front of the machine body, and transmits power from the engine 1 into a transmission case 3 through a clutch housing 2, and from inside the transmission case 3 to rear wheels 4. By transmitting the power, the left and right rear wheels 4 are forcibly driven to cause the vehicle to travel. A working machine (not shown), which is connected to the machine body by a connecting mechanism 5 at the rear end of the machine body and is raised and lowered by a hydraulic lift mechanism 6, is driven by a transmission in the mission case 3 to a PTO shaft 7 interlockingly connected to the working machine. This is done by transmission at.
The aircraft is steered by an operator sitting on a seat 8 turning the front wheels 10 using a handle 9.

As shown in FIGS. 3 and 1, the front half of the transmission case 3 has four transmission shafts 11, an input shaft 11, an output shaft 12, and two intermediate shafts 13, 14. 12, 13, and 14 are installed.
The input shaft 11 and the intermediate shaft 1 located above the input shaft 11
3, there is also a gear transmission 15 between the gear transmission 15 and the intermediate shaft 14, which is rotated by the input shaft 11 through the gear transmission 15 and is located between the input shaft 11 and the output shaft 12 in the vertical direction; A hydraulic clutch type transmission 16 is disposed between the shaft 12 and the transmission case 3, and hydraulic clutches 44, 45, 45, which will be described later in the hydraulic clutch type transmission 16, are provided on the front surface of the transmission case 3. 46,47
A hydraulic pump 17 is installed for supplying hydraulic oil to.

The oil supply device according to this invention supplies hydraulic oil to the hydraulic pump 17 and the lift cylinder 6a (FIG. 1) in the hydraulic lift mechanism 6 from the lower part of the transmission case 3, which also serves as an oil tank. It is provided as a device for supplying oil to a hydraulic pump 60 (FIG. 1).

Of the above-mentioned hydraulic clutch type transmission 16 and gear transmission 15 which are connected in series with each other, the hydraulic clutch type is equipped with a plurality of hydraulic clutches 44, 45, 46, 47 and inevitably has a large longitudinal length. The transmission 16 is disposed on the lower side within the transmission case 3, and the gear transmission 15 is provided on the upper side, so that the gear transmission 15 can have a smaller longitudinal length than the hydraulic clutch type transmission 16. The intermediate shaft 13 provided in the upper part of the transmission case 3 is formed to have a shorter length than the other transmission shafts 11, 12, 14 in both transmissions 15, 16. An extra space is formed in the upper part of the transmission case 3 at the rear end portion.

The strainer storage chamber 18 is provided in this extra space. The strainer storage chamber 18 is formed by integrating the wall of the mission case 3 and its peripheral wall, and has a strainer insertion opening 19 at one end.
and a pump-side oil passage 20 at the other end, and one side wall 3a of the transmission case 3.
The oil intake passage 21, which is bored and formed in the oil intake passage 21, communicates with the inner lower part of the transmission case 3, which also serves as an oil tank. Inside this strainer storage chamber 18,
An oil strainer 22 is inserted and installed through the strainer insertion opening 19, and the oil strainer 22 has its base 22a fitted into the pump side oil passage 20, and the leaf spring 23 is inserted along the base end cover plate 22b. After that, close the insertion opening 19 with the lid 24,
The strainer is installed inside the strainer storage chamber 18. The inside of the oil strainer 22 is connected to the hydraulic lift mechanism 6 through a supply pipe line connected to the end of the pump side oil line 20.
The transmission case side wall 3 is connected to the hydraulic pump 60 for use and opens to the pump side oil passage 20.
It is connected to the hydraulic pump 17 via another pump-side oil passage 25 in b. The lower end of the oil intake passage 21 that communicates the lower part of the inside of the mission case 3 with the strainer storage chamber 18 is an oil drain port that opens at the bottom of the mission case 3, and is equipped with a removable stopper 26. .

The above-mentioned gear transmission 1 in the illustrated case
5 and the configuration of the hydraulic clutch type transmission 16 will be explained.

First, the gear transmission 15 includes a spline cylinder 28 which is loosely fitted over a certain length to the input shaft 11 via a needle bearing 27, a transmission gear 29 fixed to the input shaft 11, and a transmission gear fitted to the intermediate shaft 13. A transmission gear 30 that is always meshed with the transmission gear 29 and rotates the intermediate shaft 13 as the input shaft 11 rotates; and two transmission gears fixed to the intermediate shaft 13 and having different diameters. The gears 31 and 32, the idler gear 33 which is loosely fitted into the spline cylinder 28 and meshed with the speed change gear 31 on the intermediate shaft 13, and the spline cylinder 28 are provided so as to be slidable and relatively non-rotatable by spline fitting. The shift gear 34 is configured to include a shift gear 34 that selectively meshes with the speed change gear 32 on the intermediate shaft 13. The idler gear 33 is formed with internal teeth 33a that can be engaged with the shift gear 34, so that the idler gear 33 can be connected to the spline cylinder 28 through the shift gear 34 in a relatively non-rotatable manner by the engagement. Also, on one side of the transmission gear 29, a spline portion 29a is formed integrally with the teeth of the gear 29 and aligned with the spline portion 28a of the spline cylinder 28, so that the shift gear 34 can be moved between the two sides as shown by the chain line. When brought to a position straddling the spline portions 28a and 29a, the spline cylinder 28 is coupled to the input shaft 11 through the shift gear 34 and the transmission gear 29 so as to be non-rotatable relative to each other. As described above, when the shift gear 34 is selectively slidably displaced on the spline cylinder 28 and the shift gear 34 is engaged with the internal teeth 33a of the free rotation gear 33, the first gear is engaged, and the shift gear 34 is engaged with the transmission gear 32. When the shift gear 34 shifts to 2nd gear,
When this is placed in a position spanning both the spline portions 28a and 29a, three speeds can be obtained in each of the spline cylinders 28.

Further, the hydraulic clutch is disposed between the intermediate shaft 14 and the output shaft 12, which are constantly connected to the spline cylinder 28 by meshing the fixed gear 35 on the spline cylinder 28 and the fixed gear 39 on the intermediate shaft 14. The type transmission 16 is configured to change gears in a total of four stages, including three stages in the forward direction of the vehicle and one stage in the reverse direction. In other words, now the members for forward 1st speed F ₁ ,
The members for forward _2nd speed F2, the members for forward 3rd speed _F3 , and the members for reverse 1st speed R can be identified by adding F ₁ , F ₂ , F ₃ and R in front of the name of each member. To explain it separately, the hydraulic clutch type transmission 16 includes an _F1 gear 36, an _F2 gear 37 fitted to the intermediate shaft 14,
_F3 gear 38 and R gear 39, _F1 idler gear 40, _F2 idler gear 41, _F3 loosely fitted to output shaft 12
Idle gear 42 and R idle gear 43, and intermediate shaft 14
Corresponding F ₁ , F ₂ , F ₃ gears 36, 37, 38 above
The above F ₁ , F ₂ , F ₃ are directly meshed with each other.
R on idler gears 36, 37, 38 and intermediate shaft 14
The output shaft 1 is connected to each of the R idler gears 43 that are meshed with the gear 39 via an R intermediate gear (not shown).
F ₁ hydraulic clutch 44, disposed on F ₂
Hydraulic clutch 45, F ₃ hydraulic clutch 46 and R
A hydraulic clutch 47 is provided. Each of the above hydraulic clutches 44, 45, 4
6 and 47, the friction plate 48 is attached to the idler gear 42 and the mating plate 49 is attached to the fixed clutch housing 6 on the output shaft 12, as shown in the figure for the F ₃ hydraulic clutch 46.
1, each of the clutches is configured to be of a multi-plate type, supported so as to be slidable only in the axial direction of the clutch, and the friction plates 48 are formed by supplying pressure oil to the oil chamber 51 behind the piston 50.
and a mating plate 49 to obtain clutch operation, and each hydraulic clutch 44, 4
By selectively operating gears 5, 46, and 47, any one of the free rotating gears 40, 41, 42, or 43 is selectively coupled to the output shaft 12, and the output shaft 12 is shifted to the first forward speed F1 _. , forward 2nd speed F ₂ , forward 3rd speed F ₃ or reverse 1
It is arranged so that it can be rotated at a rotation speed of speed R.

The output shaft 12 is operatively connected to a differential (not shown) of the driving wheels via a bevel gear 52 at the end of the shaft 12. Further, a one-way clutch 5 is provided between the _F3 idler gear 42 and the output shaft 12, which is engaged when the output shaft 12 is driven in the normal rotation direction.
3 is provided, so that when the engine is stopped when oil leaks from the hydraulic clutches 44 to 47 and the transmission path is cut off in the hydraulic clutch type transmission 16, the F is transferred via the one-way clutch 53 by the movement of the vehicle body. _3. The free rotating gear 42 is connected to the output shaft 12, and the traveling drive wheels are connected to the engine so that the engine can be easily pulled. 54 shown in FIG. 3 denotes the pump shaft 17a of the hydraulic pump 17 and the input shaft 11.
This is an oil passage bored in the input shaft 11 for guiding leaked oil from the pump 17 onto the input shaft 11 as lubricating oil. Further, in FIG. 1, 62 is a control valve for the lift cylinder 6a, and 63 is a control valve for the hydraulic clutches 44-47.

As described above with reference to FIG. 1, oil flows into the strainer storage chamber 18 formed across the opposing walls 3a and 3b of the mission case 3 from one longitudinal end and flows out from the other end. Based on this fact, the flow of oil as shown by the arrow in FIG. It is difficult for the strainer 22 to become clogged or defective. Note that the oil intake passage 21 may be formed between the outer surface of the mission case 3 and the inner surface of a plate mounted on the outer surface, like the pump side oil passage 76 shown in FIG.

Effects of the Invention According to the present invention having the above-mentioned configuration, the strainer storage chamber 18 is formed within the mission case 3 so as to extend over the opposing case walls 3a and 3b of the mission case 3, and can be formed simultaneously with the mission case 3. Because of this, it is easy to form the strainer storage chamber 18 in the same way as shown in FIGS. The strainer storage chamber 18
There is no part where oil stagnates, no deterioration of oil due to stagnation and malfunction of the pump due to the stagnation, and the excess area of the oil strainer 22 is fully utilized to achieve a perfect flow.

[Brief explanation of the drawing]

Figure 1 is a partially omitted longitudinal sectional front view and hydraulic circuit diagram showing the main parts of an agricultural tractor equipped with an embodiment of this invention, Figure 2 is a side view of the agricultural tractor, and Figure 3 is a schematic diagram of the agricultural tractor. Longitudinal side view of section, No. 4
The figure is a side view of the essential parts of a traveling work vehicle equipped with a conventional example according to the applicant's earlier application, and FIGS. 5 and 6 are longitudinal cross-sectional views taken along the - line and - line of FIG. 4, respectively. . 3...Mission case, 3a, 3b...Side wall, 15...Gear transmission, 16...Hydraulic clutch type transmission, 17...Hydraulic pump, 18...Strainer accommodation chamber, 20...Pump side oil passage , 21
...Oil intake passage, 22...Oil strainer, 25
...Pump side oil path, 60...Hydraulic pump.

Claims (1)

[Scope of utility model registration request] In a traveling work vehicle in which the transmission case 3 housing the speed change transmission mechanism is also used as an oil tank,
A strainer housing chamber 18 is formed in the transmission case 3 at a position above the oil level and communicated with the oil level in the transmission case 3. The oil supply device is configured to clean the oil and guide it toward the hydraulic pump, and the strainer storage chamber 18 is formed within the mission case 3 and across the opposing case walls 3a and 3b of the mission case 3. At the same time, the strainer storage chamber 18
An oil intake passage 21 that communicates with the oil level in the transmission case 3 is communicated with one end in the longitudinal direction, and pump side oil passages 20 and 25 are communicated with the other end. Oil supply device.