JPS5849527A - Hydraulic gear for traveling farm working vehicle - Google Patents

Abstract

PURPOSE:To ease cleaning work of the strainer in such a way that a hydraulic pump which is installed on one side of the wall of a transmission case is communicated to a suction oil path which is provided on the other side of the wall, and a strainer is arranged in a connecting path which is formed at the part higher than lubricating oil level. CONSTITUTION:An oil path plate 3 is stuck in the front of a transmission case 1, and a hydraulic pump 8 and seal cases 38, 39 are stuck further forward than the oil path plate 3. On aother hand, the rear side of the transmission case 1 is covered with a center plate 2, and a suction oil path is formed between the both. And, a strainer is arranged on a connecting oil path which is formed in the transmission case 1, and connects the hydraulic pump 8 to the suction oil path. In consequence, in case where the engine is stopped, since the strainer 54 is located at a higher place than oil level, even if the strainer is taken out for cleaning, there is no instance that working oil may be spilt.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for attaching a strainer to a suction circuit, which can be implemented in all hydraulic circuits that suck and discharge hydraulic oil or lubricating oil.

The strainer in the hydraulic circuit filters chips and metal scraps in the transmission case, as well as dust deposits that come in from the pleather, etc., and prevents the hydraulic pump, hydraulic motor, hydraulic control valve, hydraulic clutch device, etc. This is to prevent malfunctions and abnormal wear caused by jamming. However, when used for a long period of time, these impurities accumulate on the strainer mesh, so if they are not removed, the suction resistance increases, and over a long period of time, chips etc. may come off the mesh and pass through. I end up doing it. Most conventional strainers are inserted and fixed from the outside of the wall in a position submerged below the oil level in the transmission case, so when trying to clean the strainer, hydraulic oil and lubricating oil are also lost. Because it would spill, I always had to replace or add hydraulic oil and lubricating oil.It was a pain to prepare the oil before refilling it, so I tended to neglect cleaning the strainer. be. Chips and other contaminants are filtered out by the strainer, so cleaning only the strainer is enough. Although it is possible to use hydraulic oil and lubrication, it is necessary to remove the oil every time you clean the strainer. I had to change it.

In the present invention, the strainer is installed above the lubricating oil level in the sealed suction oil passage, but when the engine stops, the negative pressure in the suction oil passage disappears and the strainer is exposed to the air. - can be removed and cleaned.

The purpose of the present invention is as described above, and the present invention will be described in detail based on the configuration of the embodiment shown in the attached drawings.
2. −・The following is white! \, -1' , , 7 Figure 1 is an overall side view of the y-separation work 11L, Figure 2 is a diagram of the assist mechanism of the mobile work vehicle, Figure 3 is the front view of the transmission case, and Figure M4 is the transmission. FIG. 5 is a side view of the case, and FIG.

The immovable work vehicle is H1, 2-axle, 2-wheeled wheel running vehicle, M of the mission case (1) between the image and 1&wheel.
+] Frame can be folded completely in the capital [toe 1] After that, horizontal folding is possible 6 times. steering handle t
By turning M7), a hydraulic cylinder is moved, and the front section is deflected and steered using a power steering system.

Place the packet on the front of the aircraft and boom.

Between the boom mounts, the γ output pressure cylinder II) is configured to rotate the packet vertically. An engine compartment is provided to stop the rear wheels, and the engine compartment is placed inside the engine compartment. A driver's seat is installed above the engine room,
A forward/reverse speed change lever (a auxiliary speed change lever σ8) and an inching pedal σl) are provided near the driver's seat.

The power transmission system will be explained in FIGS. 2, 4, and 5.

Engine - Shock Afsol on the crankshaft/
(-(6) to the universal joint N7), and the tip of the universal joint (7) is connected to the input shaft C1.
It is connected to 9. The input shaft Q〃 is connected to the mission case (
11, the tip 4 of the input shaft L1]J, which is connected to the loose gear on the forward shaft 04 by r, M Jttol), protrudes to the front of the mission case CIJ and is provided in the protrusion. It drives the pump gear of the hydraulic pump (8) and also drives the pressure pump μQ. Pressure release button: / button (8
) is the transmission case (1) I'i's hydraulic clutch scissors 1
This is a pump for supplying pressure oil to d, and the pressure is as low as about 15 lbs. On the other hand, the pressure pump song is a packet (
Work 1 for backhoes etc. attached to the isthmus: High-pressure pump for spinning the rope.P1 pressure is high pressure of 60 to 50 degrees. As for the hydraulic oil, the t-pressure pump (8) is in the Mick 1 case (1
) is used in front of the shrine rtt, but the high-pressure pump also has a hydraulic oil tank from which it sucks hydraulic oil.

The free-fitting wheel Cv on the forward drive shaft (1) is then excited by the human power (the gear on the left), but the free-fitting wheel Cv on the reverse shaft (b) is also The fitted gears (surfaces) are meshing at the same time.1ge reverse gear shift lever (reverse + C to p1 forward and backward oil pressure trace) In the school of the master, by operating the rope in the up and down direction, the gear can be shifted to neutral, r; i + Go forward, go backwards.

When the vehicle is in neutral, both the forward motion hydraulic pressure latch device 11 and the forward motion hydraulic latch are in the "off" state. In the case of demarcation, use the forward RI 4-pressure shoes clutch if
When mJI is "contact", the power is transmitted from the M fitted gear 3 to the fixed gear via the forward shaft, and the fixed gear -j#L (to)
The assist force is transmitted to the fixed gear (A) above the gearshift shaft, and then to the auxiliary gearshift shaft Q1.Similarly, in the case of reverse, the hydraulic clutch device for reverse
is in the "contact" state, gear 0, the power of the idler gear G υ is transmitted to the idler gear IJ, and the fixed gear vQ is connected to the fixed idler gear 4 on the auxiliary gear 1mjpa. Since the gears are always aligned and h, power is transmitted to the sub-shift shaft (to).

With respect to the fixed gear (2) on the cutting gear shaft, the forward shaft 94 and reverse gear 94 have the same number of teeth.
The forward axis (2) and the reverse axis are located on the apex of the base of an isosceles triangle centered on the button (sub-shift axis 0) shown in FIG. And forward axis a barrel and reverse 1fI
J+ (2 loose-fit gears with the same number of teeth between 14i and 11e
It is linked with 91 by j6+. With this configuration, rotation at the same speed in both forward and reverse directions is transmitted to the sub-shift 1t4i1. In this way, while the forward and backward shifting is carried out by the left and right hydraulic clutches arranged plano-concavely and the two-way device u, three-dimensional shifting is carried out in the longitudinal direction on the auxiliary shift +111i1 Ci4.

That is, from the 1QIJ force on the sub-shift shaft (14) to the 2nd speed, 3rd speed
Hydraulic clutches for the first and second speeds are installed, and a loose-fitting gear 1l is installed on each hydraulic clutch device W-porridge φ.
Cl! j (to) it is sunk and the pressure on the latch ridge)
・As the state gear is in a state of being in a state of deterioration, the corresponding freewheel gear so-■ begins to rotate 1U at 111II gear shift 4q11θ;

Playing gear 1 (to) (to) (to)
It always connects with the fixed blue wheel ■@(7) on i9 and transmits power to counter l1IIIlσυ. counter axis 05
The rotation t4L is transmitted to the drive shaft from the fixed two parts (g) on the first track of the drive 4III through the engraved W tun 4.

hiA mJ4ph (The rear end at 1 o'clock is the rear pinion 11
11Q7), and the front end of the drive shaft 0(2) is transmitted from the coupling ψ9 to the front pinion shaft via a universal joint in a bendable manner.

The transmission case (1) is a box body with an integral front M and an open box body), and the rear side is a center plate (2), and the bottom part protrudes rearward from the vertical sub-transmission shaft (b), so the lid body (4
). The front side of the mission case (1) is affixed with an oil road plate (3), and the hydraulic pump (8) and seal case (□□□ (hook, 4) are affixed on the 511 side of this oil road plate. Pressure oil is sent to the forward shaft, sub-shift shaft, and reverse shaft.

Also, as shown in Fig. 7, the strainer and its installation are also done on the oil passage plate (3).

As shown in FIG. 3, various hydraulic devices are attached to the front of the oil passage plate (3) on the front of the transmission case (1). The lid of the second relief pulp (G) is placed on the human power axis Qη, the inching valve (G) is placed on the right side of the human power axis Qη, and the sudden start prevention IJ IJ-7 valve is placed on the right side of the human power axis Qη.
0 and then sub-shift hydraulic pressure tlflJ ff11
Valve CB) is provided with a hydraulic control valve for forward and backward movement on the lower right side, and a strainer fixing system below it. (field) is an oil checking device.

Figure 6 is a hydraulic circuit diagram of this transmission, Figure 7 is a 16r side view of the hydraulic control valve for forward and backward travel, and Figure 8
The figure is a side FIJj side view of the auxiliary liquid hydraulic control valve (H), Figure 9 is a side sectional view of the inching valve (2), and Figure 1θ is a side sectional view of the sudden advance prevention +717-7 valve C).
Figure 11 is a side cross-sectional view of the second relief pulp (to) 〇 Following the movement of hydraulic oil and explaining the hydraulic system and its function, the water accumulated in Jitf = fi5 of the mission case (1) iv (Suction front (2 &) formed between the center plate (2) and the rear surface of the blind case (1)
After that, it is inhaled through a strainer. The sucked hydraulic oil passes from the oil passage of the center plate (2) through the connecting oil passage (1a) of the transmission case (1) and is connected to the front of the transmission case (1) and the oil passage plate (3). The oil enters the oil passage and rises, is sucked into the hydraulic pump (8), and is discharged as pressurized oil.

The connecting oil passage (1a) is fixedly installed between the strainer center plate (2) and the front of the transmission case (1).
), and the surrounding area is protected.

When the engine is stopped, a normal strainer warps in the hydraulic oil, but the strainer with this configuration is above the oil level, and is designed to catch the lubricating oil while it is being sucked in, so it can be used for cleaning purposes. This means that the hydraulic oil will not be damaged even if 9 is released. The space between the strainer and the mounting body can be removed, and the strainer country can be taken out and cleaned together with the fitting body. (54a
) uses a plate spring to keep the low-intensity pottery and strainer in check.

Is the pressure oil discharged by the hydraulic pump (8) the sub-shift hydraulic pressure?
1+IJ Gosho).

Pressure oil is sent to the 8th P boat. Figure 8 shows the intention to file a petition, and the P boat is located at 'xiIi oil road (56a).
Since the other end is closed, the pressure oil flows in the direction of the sudden start prevention relief pulp C).

Also, the return p@ from the F3 boat of the hydraulic Kurasochi device for forward 3 speeds and the beak is from the small diameter part (56d) to the drain boat.Similarly, the F2 boat is also notched from the sliding part # (56e) to the drain boat. (sad) to the drain boat.

When the sub-transmission spool is pulled up one step, the P boat is connected to the PIl boat through the notch (56b), and the pressure oil is transferred to the first
The continuous hydraulic clutch device is in the "engaged" state. The F2 boat uses the penetrating oil passage (56a), and the F3 boat uses the small diameter section (s
6d) is connected to the Citrane boat.

When the IJR is further pulled up, the P boat is connected to the 9F2 boat through the notch (56b) and becomes b'wA 2nd speed, and the F
The F3 boat is connected to the Citrane boat through the sliding passage 1 (56c).

When the boat was pulled up further, the P-boat entered the X oilway (56a).
Connected to 9F3 boat and becomes #111 3rd gear, Fl
The boat is connected to the drain boat via the detent 14(N)e valve, and the F2 boat is connected to the drain boat via the notch (56b).

Further, the pressure oil from the hydraulic pump (8) is sent to the forward and backward movement valves via the inching valve I.

Inching valve I is inch puffer pedal ff1lwojl
The pressure oil of the hydraulic pump is removed by filling the housing (1
1) Instantly drop the pressure. Even if each hydraulic clutch device is in the "contact" state, operation of the inching valve (c) changes all the clutches to a half-clutch state or the ridge edge of the hydraulic clutch for forward/reverse movement changes to the "W" state.The state of the inching valves shown in Figure 089 indicates a completely closed state, and all the pressurized oil flows from the P boat to the A boat through the notch (57b), and is placed in the 1jff hydraulic training valve.From this state, the inching When the inching spool art of the sinking valve (2) is pushed into the pedal (11J), the M extra surface (57e) communicates with the υ boat, and part of the pressure oil flows into the f#4 lubricating oil port. The υ boat is connected to the second relief valve■, but the second relief valve is 2~3″
Since the pressure is set to a low pressure of EI, the hydraulic circuit is at a low pressure of 2 to 3 degrees, and the sub-shift hydraulic clutch device becomes a half-clutch.

By pressing the inching pedal 4 against the spring so that the inclined surface (57) gradually moves toward the L boat, the strength of the half-clutch state can be adjusted (12 in). When you step on the Chingespool!71, the pressure oil of boat A will be connected to the drain boat, r1i
J reverse hydraulic clutch device U is completely disconnected.

However, since the pressure oil in the auxiliary transmission hydraulic clutch device is held back by the second relief valve (2) to (3), the clutch remains in the half-clutch state.

The pressure oil that has passed through the inching valve (c) flows into the forward and backward movement hydraulic pressure 1.

Figure 7 shows the neutral state of forward/reverse gear shifting, and the pressure oil that has reached the P-boat is absorbed by the forward/reverse spool (notch 51 (53
c) Flowing from the Yoshi υ boat to the lubricating oilway. The forward and backward spool (- is raised to move forward, and the pressure oil of the P boat flows from the through oil passage (53b) to the F boat and reaches the forward hydraulic clutch system *1111. Conversely, the forward and backward spool 16F4 is When lowered, the speed becomes faster, the pressure oil of the P boat reaches the R boat from the notch (53a), and the reverse hydraulic clutch device becomes engaged.

When the inching valve (c) is open and the forward/reverse hydraulic pressure control valve is in a position other than neutral, the sub-shift hydraulic pressure)
At any position, the pressure oil will not be able to escape and the pressure will increase. If the pressure is increased rapidly, the piston of the γ-Sanno clutch device will move rapidly, and the power will be transmitted abruptly, resulting in a sudden start.To prevent this, increase the pressure in such cases. To delay? & Start prevention IJ jJ-F valve 0 is provided. Pressure oil communicates between the inside of the cylinder of the mountain pressure latch and the P boat of this sudden start prevention relief valve (C), but the spring force of the spring for returning the histone of the hydraulic clutch device is stronger than the spring force of the spring of the hydraulic clutch device. Since it is larger than the spring (62), the pressure oil that entered the back chamber (63m) pushes the relief parboo against the spring (62), connecting the notch (63b) and the boat, and presses out. L
Let them escape to the boat. Quick return pulp at the same time! 8) also moves toward the pressure, and the embossed hole (58m) and notch 59a] communicate with each other. If this continues, the pressure of the pressure oil will not rise forever, so it is necessary to gradually increase the reaction force of the spring (62). Through the hole (58m),
Pressure oil enters through the oil passage (59e) through the notch s (59a) of the accumulator-q, and the spring receiver pushes the sprue to raise the tension of the spring (62).

At this time, the quick return pulp is pushed by the pressure oil of the P boat and moves to the left against the spring.Otherwise, in order to make the rise of the oil pressure si gentle (9t), first the accumulator is moved. The pressure oil that has entered the back chamber (59c) through the hole (58a) and the notch (s9m) is guided to move the accumulator ceramic to the right of the 1st O cause against the force. , Following the 1i8 movement of the Akiemulator, the spring holder is configured so that the spool spring moves to the right.) The spring holder allows the spool to return steadily as the spool spring moves to the right9. The pressure of the hydraulic clutch becomes the specified pressure and it becomes connected. From this state, the MU hydraulic pressure control for reverse
When the P prisoner was in the neutral position, the oil pressure of the L boat was 12 to 3.
7) < Lupu (P of Q) to prevent sudden start.
The pressure of the boat begins to rise. As a result of this pressure drop, the accumulator, ff, and relief valve immediately return to their normal length, causing the IJ leaf valve to move to the right, and the P boat to return to its original position. (15) If you remove all the pressure oil and lower the oil pressure curve to near zero, the next time you shift gears, the clutch will connect from a low pressure close to zero, which will cause a sudden start, but the quick return valve is... Press it with the pressure oil of the P boat and open the crest hole (58a
1. :The back chamber (59c) of the accumulator ceramic and the spring holder are guiding pressure oil to the back 'M (6, 18) of the spool knife through the notch (59JL) of the accumulator ceramic, so when it returns. If the spring holder passes through the pattern hole (58a) and comes out, the spring holder cannot make a quick return of the school. Quick return pulp-J is installed in this case, and when sending pressure oil to the back room (61 m) of the spool, use quick return pulp-J to spring with pressure oil from P boat. Push it to the right against the resistance and insert the emblem hole (58a).
I make sure that the receiver does not enter the back room (61a) of the school, but if the pressure oil in the back room (61&) returns, the pressure oil in the P boat will drop. Yo Shibane-t
The quick return pulp () is pushed back to the right by In, and the embossed hole (58JL) moves to the right, and the notch (
The return oil of 59a) quickly escapes from the spring chamber of the spring through the drain oil path (s9b) (16), and the spring holder moves to the left on the spool + 611, and then when the gear shifts, it moves to the lJ leaf knob. should be ejected at low pressure to prevent sudden start (consisting of 0) In Honsakaki Sei, the sudden start prevention relief valve Yu is 2!R above and below.
, one P stage is equipped with a relief knob (a spool 11111 and a spring 62) in series, and the other stage is equipped with an accumulator on its outer periphery, and quick return pulp V31 is installed on its inner periphery. As shown in the hydraulic (b) schematic diagram in Figure 6, when the forward/reverse hydraulic pressure control valve is neutral, the pressure oil in the P port flows with the lubricant (g) boat, and the inching Apply pressure oil from valve 0 to the inclined surface (5
7c) Even when running away from (g) boat, it is pronounced b
In addition, when the oil pressure control unit ω) is in neutral, the pressure oil is stopped and the oil is blown out from the sudden start prevention lubricant (C) and sent to the υ boat.

Previously, the pressure oil leading to the υ boat was used to prevent sudden start IJ 17-7
The only leak was from the valve (Q).

The neutral pressure oil of each hydraulic control valve was communicated with the drain circuit. Therefore, during neutral gear shifting, the pressure oil in the pump boat communicates with the drain and is almost at zero.
The sudden start prevention relief pulp (C) did not spray out from the boat to @beak oil outlet 4.

The I4 lubricating oil outlet ■ is opened on the forward shaft (B), the reverse gear 411α, and the M transmission shaft (to) on which each hydraulic clutch device is mounted, and between both shafts in each seal case ((2)). End oil road (3
8m) (40m) (39a) to each discharge port. The pressure oil discharged from the lubricant discharge row lubricates the friction plates of the hydraulic clutch device from within.
If the shield is used for a long time when the vehicle is in neutral, the friction plates become tangled and the vehicle, which is supposed to be stationary, begins to move. To prevent this, the system is designed to discharge lubricating oil even when in neutral.

The pressure of the (g) boat for lubricating oil is set low. In Figure al1, the second relief valve (■) of the (g) boat is shown. Insert the shell through the pulp case βlvt oil passage & (3) and the mission case (1), stop at the stepped part, and insert the spool tie and spring (67) inside the valve case. Fix with 4 and h
Ru.

When the pressure starts to rise above If, pressure oil enters the back chamber of the spool (J) through the oil hole (65a), pushes the spool to the left against the spring (67), and the notch of the sgur dies. (66
b) leads to the notch (65b) of the valve case-j, and low-pressure lubricating oil flows out.
As described above, the present invention is configured so that the hydraulic clutch surface can be easily positioned and physically displayed even when the transmission case (1) is in neutral. ), a suction oil passage (2a) connected to the lubricating oil surface is provided on the other side, and a connecting passage (la) communicating with the suction oil passage (2a) is provided above the lubricating oil surface between both walls. A strainer is tightly fitted in the connecting passageway (la) to filter lubricating oil and suck it into the hydraulic pump (8), so the engine stops and the hydraulic pump When the suction pressure (8) is lost, the lubricating oil accumulates at the bottom of the transmission case, the strainer is exposed in the connecting passage (la), and the fixed sentry is removed from the outer wall of the mission case to remove the strainer. Even if the strainer is pulled out, the lubricating oil will not spill and the mesh of the strainer can be cleaned and washed.

[Brief explanation of the drawing]

Figure 1 is an overall side view of the mobile work vehicle, Figure 2 is a power transmission diagram of the mobile work vehicle, Figure 3 is a front view of the transmission case, Figure 4 is a side sectional view of the transmission case, and Figure 5 is A side sectional view of the reverse shaft 0a portion, (201) Figure 6 is a hydraulic circuit diagram of the device of the present invention, Figure 7 is a side view of the hydraulic control valve (5) for forward and backward movement,
Figure 8 is a side sectional view of the sub-transmission hydraulic control valve (B), Figure 9
The figure is a side cross-sectional view of the inching valve (2), Figure 10 is a side cross-sectional view of the sudden start prevention relief valve (0), and Figure 11 is a side cross-sectional view of the second relief valve (G). (1)...・Mission case (1a)...Connection passage (2)...Center plate (2a)...Suction oil path (3)...Hydraulic pump (6))...Strainer-fixing body (54) ...Strainer Applicant: Kanzaki Kokyukoki Seisakusho Co., Ltd. Agent, Patent Attorney: Toshikazu Yano C21) JP-A-58-49527 (10)

Claims (1)

[Claims] A hydraulic bonder is provided on one of the opposing walls of the Minyon case, a suction oil passage connected to the lubricating oil surface is provided on the other side, and a connecting passage communicating with the suction oil passage is provided above the lubricating oil surface on both walls. A hydraulic system for a mobile work vehicle, characterized in that a strainer is tightly fitted in the connecting passage, and lubricating oil is filtered and sucked into a hydraulic pump.