JPS59155648A - Hydraulic power transmission for work vehicles - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Pilot]/i, A hydraulic cylinder holder for high and low gear shifting is attached to the transmission Kawaden MI@, which is mounted on a shaft in the mission booth, and pressure oil from hydraulic bombuka island etc. is attached.

In the above, for example, the lowest speed state in forward movement, that is,
When shifting from poor first forward speed to second forward speed, which is one step higher than that, the first forward continuous cylinder is suddenly switched to the oil drain condition, resulting in a large deceleration, and then the second forward continuous cylinder is activated. The problem is that the speed difference caused by the shift is large, causing a so-called jerking phenomenon, which can cause a relatively large shock to the driver.6 In particular, crawler traveling systems Then, as the forward first continuous cylinder is suddenly switched to drain oil, most of the running force is stopped, and the above-mentioned shock yj5
It was a big deal, and it was also dangerous.

In view of the above points, it is an object of the present invention to reduce the total shock caused by shifting from a low speed state to a high speed state while driving, and to enable a smooth shift from a high speed state to a low speed state.

In order to achieve the above object, the present invention is applied to the hydraulic power transmission for JE described in 1. When shifting to the high speed side, it resists only the oil discharge from the hydraulic cylinder at the lower speed. It is characterized in that a small groove portion of the borrowed surface and the bond is provided in the return communication Ip1 formed in the spool of the valve to communicate with the cylinder of the non-operable system.

The effects of the above configuration are as follows.

In other words, when changing gears from a low speed state to a high speed state while driving, even if the low speed cylinder is switched to the oil drain state, resistance is applied to the oil drain, and the speed is not greatly decelerated immediately after switching, but is in a so-called half-clutch state. On the other hand, when changing from a local speed state to a 1°C low state, there is no resistance to the oil drained from the high-speed cylinder, and the speed is shifted to a high speed state. Instead of immediately decelerating the engine, pressure oil is supplied to the low-speed cylinder.

The effects of the above action are as follows.

In other words, when shifting from a low speed state to a high speed state while driving, it is possible to suppress the deceleration caused by suddenly switching the low speed side cylinder to drain oil, and it is now possible to shift to a high speed state with a small speed difference and less shock. Moreover, when changing gears from the high speed side to the low speed side, there is no resistance to the oil discharged from the high speed side cylinder, and the gear shift can be smoothly performed without unnecessarily continuing the high speed state.

Moreover, in order to perform the above-mentioned speed change action, only a return passage is provided in the pulp spool. In addition to providing a two-position switching valve, a device is attached to the speed change operating tool to detect the operating direction thereof, and the flow path is configured to throttle drain oil to the low speed side cylinder based on the detection of the speed change operation state to the high speed side by the detection device. This has the advantage of being extremely simple in structure, compared to adopting a complete configuration in which two-position switching valves are automatically switched.

EMBODIMENT OF THE INVENTION Below, one embodiment of the present invention will be described in detail based on illustrative drawings.

1) Raise and harvest the standing culms in the field, feed the harvested culms to the rear of the machine, change the posture of the fallen culm, and receive the cutting parts (2) into the feed chain (1). ),
Then, the harvested stem culm is threshed by the feed chain f+) while being conveyed in a clamping manner.
5) One traveling body with continuous pitching and reaping part (2)
(1 self-lifting unit is freely provided, and a combine harvester is connected via a 13-pressure cylinder (2a).

When the traveling equipment d(4) is used, the engine 113
The power from 1 is transferred to a 3-speed gear-type transmission structure (7) with auxiliary gear shift, and 733 front and reverse gears for the main speed (C-shiftable hydraulic power transmission structure (7)). 8)
As a whole, the gears are configured to be freely variable and transmit the transmission to the P gear and the three reverse gears through the gear, which will be described in detail below.

That is, the engine (6) is placed in the mission case (9).
The input shaft 11o) is linked to
fiHJ axis to), u2), 031, steering 7
7 H-4) is attached to the clutch shaft (national, left/right running drive shaft U61. The input shaft (10) and the first transmission shaft (1
1), and the gear type auxiliary transmission mechanism (7) is provided between the y-th (H moving axis aη and the output axis (L)), and the gear type transmission mechanism aω that can freely change two speeds is provided between the y-th (H moving axis aη and the output axis (L)). The first and second hydraulic clutches gI for shifting are provided on the first transmission shaft at.
l, z, and the third and second to the J-th transmission axis 0 (8)
Hydraulic clutches H), 122) are attached, and these clutches @l, ! 21).

+22, @The transmission gear ring, which is integrally rotatably connected by each input operation, is connected to the second and third transmission shafts 112.
1, +13) The first and second hydraulic clutch marks) are connected to each other through oil passages (not shown) which are bolted to the bottom and formed in the second and third transmission shafts 1121 and U31, respectively.

I2]l, 12'; A, 1231 is configured to supply pressure oil to the respective cylinders (20a), (21a), (22a), and (23a).

The hydraulic cylinders (20a) (21a) (22a) (2
As shown in Fig. 3, the gear oil in the transmission case (9) is used to configure the hydraulic circuit for 3a).
4f' to supply through oil filter track, hydraulic pump needle and rotary type control valve 7)
M, and the control valve (neutral state tNl, reverse state j center ■, and forward-speed three-speed state (F□) (F, )CF,) are selectively controlled by the two-force 177 conversion operation. It is configured so that it can be obtained. An accumulator (c) is communicatively connected in the middle of the pressure oil supply path to the control valve, and is configured to prevent a sudden start unless the neutral state is switched to the first forward speed state or the reverse state. I'm doing it. In addition, a return oil passage (a) with a relief valve 9) interposed in the middle of the pressure oil supply passage to the control valve B is connected, and the return oil passage (30) is connected to the
1rI hydraulic clutch dO), 121), +2
2i, 123), and the relieved oil is supplied to the hydraulic clutches 120), (21).
, C2''2J, [23) are drawn to cool each of them.

HUE control pulp [27+ /i, the transmission case (9) is provided with internal pressure with its longitudinal direction parallel to the vertical motion axis (11), and the control valve is An accumulator +28 is provided so as to butt against the inner edge of the case of +27). Also, the longitudinal direction of the oil filter 0 is the transmission shaft! Ill... is installed in parallel with the oil filter t25) and the hydraulic pump c.
26), control valve 2'7), accumulator, 28), and cylinder (20a) (21a) (22)
a) (23a) are connected to each other through an oil passage formed in the mating surface of the transmission case (9) and the hydraulic plate Gll attached to the transmission case (9).

To configure the control valve ■ηft, as shown in FIG. Pressurized oil () (loop case)
Output port (R) (F,)CF,)(F8
), and the spool 3
On the outer Fd surface of
33) Connect all output ports other than those connected to the transmission case (
9) On the way to the inside, there was a 116m turn around 33).

6th speed C speed 11(
In the direction of rotation of the spool + 32J, there is a floor C that is higher than the communication path (33) (, at the end located at '1) than Noto.
(Singing the small eaves part (35a)) From the first forward luck state to the forward first second luck state! Or, when changing from the forward 2nd speed state to the forward 3rd state, rotate the spool (c) to complete the speed change t11, H.
80-speed 2-speed output boat CF,) or 1st forward series boat CF3) with 3 series, one step slower than that, 1st forward series boat (F,) or 6f
2nd operation port (F2) All mountains
W self 7+4 'ei+s (35a) to provide resistance to oil drainage from cylinder (2), a) or (22a), and hydraulic clutch 211, b and d immediately disengage when shifting. The structure is designed to prevent this from occurring.

Said clutch swell] t 1211 , t2Z ,
123+ Fist, L and A, respectively, and as shown in FIG.
When the gear shift operation is performed, a part of the supplied pressure oil is released through the hole, and the clutch is opened to prevent the clutch from suddenly turning on. It is completed.

The operating tool linked to the pulp spool (321)
As shown in Figs. 4 and 6, the lever guide □□ consists of a forward operation path IB and a reverse operation path IB.
) and the position and eyes are different from 1 ryo meridian & 6 (Al
tB), the operating tool (1. which is slightly larger than the diameter of the ceramic)
1 path + C) ff: Form a guide groove (41) so that they are connected in a neutral position, and displace the operating tool (tc, h in the middle of the split to the forward operating path ■ side) The vehicle is provided with a leaf spring region that biases the vehicle to move forward, and is configured to prevent the vehicle from accidentally moving backward when the vehicle is operated toward a neutral position to stop traveling during forward travel.

In addition, a recess f+a is formed at the neutral side end of the reverse operation path CB), and when the reverse operation is operated to the neutral position side to stop traveling during reverse travel, the recess f+a is locked to the recess (state) and
C) is configured to effectively prevent forward operation toward the cine side.

The present invention is applicable not only to the rotary type but also to the slide type control pulp (c).

The power transmission [81k 46 consists of, for example, a transmission gear control is loosely fitted to the transmission shaft 121, 03+, and a connecting pin is provided in the transmission shaft rotation, υ3) to connect or disconnect it from the transmission gear shaft. The connecting pin may be provided so as to be freely retractable in the radial direction, and a cylinder may be provided for operating the connecting pin to move in and out.

The present invention is applicable not only to a combine harvester equipped with a crawler traveling device but also to various work vehicles such as a riding-type tiller equipped with a tire-type traveling device.

[Brief explanation of the drawing]

The drawings show an embodiment of the hydraulic power transmission for a working vehicle according to the present invention, in which Fig. 1 is an overall side view of a combine harvester, Fig. 2 is a schematic longitudinal sectional view of a transmission case, Fig. 3 is a hydraulic circuit diagram, and Fig. 4 is a longitudinal sectional view of the main part, FIG. 5 is a longitudinal sectional view of the hydraulic clutch and a cross sectional view of the rotary pulp in ice, and FIG. 6 is a sectional view taken along the line ■-■ in FIG. 4. (9)・・・Mission case, u21tia
+...Transmission shaft % (20a) (21a)
(22a) (23a)...Hydraulic cylinder, □□
□・・・Hydraulic cylinder 7', +271・・・Control valve, ta21・・・Spool, 1
3υ...Return groove, (35a)...
・Groove part.

Claims (1)

[Claims] Transmission shaft j2 for transmission mounted on the mission booth (9)
) Hydraulic cylinder for height variable ml in f131 (2
0a) (21a) (22a) (23a) and is configured to supply pressure oil from a hydraulic pump 126t through a control valve 121. When shifting gears to the side, a groove portion (35a) with a small area of 4fη is made to communicate with the cylinder in the non-operating position in order to provide resistance only to the oil flowing from the hydraulic cylinder one step lower than the hydraulic cylinder. Hydraulic power transmission for work (1), which is a return communication groove K1+rii formed on the spool i34 of the pulp wire.