JPS59103059A - Transmission apparatus - Google Patents

Abstract

PURPOSE:To detect a trouble in a speed gear shifting system in agricultural equipment by disposing two flow passage switching valves in series which can be operated separately by a pilot pressure valve of a clutch operation valve mechanism. CONSTITUTION:With actuators 13-15, 18 in neutral position, a hydraulic clutch 2 for the drive system is automatically operated by two way switch valves y2- y4, and a hydraulic clutch 11 for power take-out by valves y5, y6, such valves being operated separately by a pilot pressure of three way valves X1-X6 that check the pressure oil from corresponding valves V1-V3. The valves y3, y4 are interposed in series in an operating oil passage 22, which are set to allow the flow of the pressure oil under different operating conditions. When both the switch valves y3, y4 are in the mode of supplying the pressure oil due to a trouble, the clutch 2 is disengaged to bring the vehicle to a stop to warn the trouble. The valves y5, y6 are interposed in series likewise to warn the trouble by stopping the power take-out shaft 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides pilot pressure pulp to each of two hydraulically driven shifters which are provided in a transmission so as to be selectively in a transmission state, respectively, in a transmission state and a non-transmission state of the shifter. A valve mechanism for clutch operation, which is operated by opening and closing of both the pilot pressure pulps, is provided in the operating oil passage of the clutch, which is installed in series with the transmission, and which is operated by opening and closing the pilot pressure pulps. The present invention relates to a transmission device configured to automatically operate a clutch in accordance with the transmission.

In the above-mentioned transmission device, the clutch operating valve mechanism has conventionally been constructed using two flow path switching valves (1) each operated separately by pilot pressure pulps (xa) and (xb), as shown in FIG. ya), (yb),
Operation oil passage (2) (interposed in parallel in two bottles, and a flow passage switching valve (ya) when the shifter (8), (b) is selectively switched to the transmission state side , (yb) are selectively opened, and the clutch (2) is operated to engage transmission.

However, the pilot oil passage is clogged and the shifter (al
, (b), and both flow path switching pulps (ya) and (yb) are open, the clutch (2) will not engage the transmission as usual. Due to the sudden shifting operation, the driver may not be able to recognize that a problem has occurred, which may lead to damage to the transmission or an unexpected accident.

In view of the above-mentioned conventional situation, an object of the present invention is to make it possible to reliably recognize troubles in the speed change operation system by rationally and simply improving the flow path switching valve.

The characteristic configuration of the present invention is that in the above-mentioned transmission device, the clutch operating valve mechanism includes two flow path switching pulps each operated separately by the pilot pressure pulp.
They are arranged in series, and the clutch is formed so that the clutch is in the transmission disengaged state only when both the shifters are in the non-transmission state and the transmission state, and the functions and effects thereof are as follows.

In other words, even when both shifters are in the transmission state (that is, when both flow path switching pulps are both pilot operated to the clutch transmission on state side), the clutch is configured to be in the transmission disengaged state. When a trouble such as a clogged oil passage or incomplete shifter operation5 occurs, the operator is surely notified of the trouble by the phenomenon of stopping the transmission without using a special alarm mechanism, and is urged to carry out repair and inspection. This makes it easier to prevent transmission damage and unexpected accidents caused by such troubles.

Moreover, if the clutch operation as described above (so-called exclusive OR operation) is to be performed using the conventional parallel arrangement of channel switching/< loops, the channel switching pulp must be configured as a three-position switching valve. However, according to the present invention, by arranging the flow path switching pulps in series, these switching pulps can be configured with a simple co-position switching valve. In addition, the pilot pressure operating circuit only needs to be connected separately to the pilot pressure pulp and the replacement pulp, making the overall structure extremely simple and advantageous in terms of production and economy.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

R + 3) and the super deceleration switching device (4) in that order, and the power taken out from the super deceleration switching device (4) is transmitted to the left and right pair of rear wheel differential devices (5). The rear wheels (6), the transmission shaft (7) and the front wheel peripheral differential w(
8) to a pair of left and right steering front wheels (9). And the main transmission il+
The power branched from the upper side of the transmission is transferred to the power extraction transmission (
10) and a hydraulic multi-disc clutch (+1) to transmit the power to a power take-off shaft (12) for driving a working machine, and constitute a drive device for a working vehicle such as a double-wheel drive type tractor. .

Each of the transmission devices fi+, +3+, +41,
(As shown in Figs. 1 and 2, 101 consists of two positions (N,
The traveling system variable speed pulp (vl
) in the main transmission mechanism tl), the actuator (13a
), (13b), and an actuator (14) for operating the shifter (C) for switching between high and low speeds in the auxiliary transmission (3).
) is configured to integrally supply pressure to the main transmission tll to produce a second gear shift and a second gear shift in the auxiliary transmission (3), and the sliding J position (, N, F , R) The forward/reverse switching pulp (V2) configured in the switching valve operates the actuator (+5) for operating the forward/reverse switching shifter (d) in the auxiliary transmission (3), thereby causing the forward/reverse 62
It is configured to obtain a step change state.

Then, the mechanically operated shift device (+6) operates the super deceleration switching device @ (4) to switch between the normal deceleration state and the gradual deceleration state. The device (17) is configured to intermittent power transmission to the front wheel drive transmission shaft (7) to switch between a two-wheel drive state and a single-wheel drive state.

In addition, the j position (n
, f1 to f4) The power take-off system variable speed pulp (VD) configured in the switching valve controls the two-speed change shifter (e) in the power take-off transmission (10), (f) actuator for operation (18a), ( 18b) is integrally operated, and the power take-off system is shifted to high gear.

In addition, (P) in the figure is the mission case input shaft (s
1) is an operating pressure oil supply pump directly connected to.

When operating each of the clutches (21, C11), the second
As shown in the figure, each of the actuators (13a).

(13b), (141, (15), (18a), (
18b) in Sifuku (a), (b), (C
), (d), (e), (f) These actuators (13a), (13b), (+4
), Q5), the corresponding valve (vl) only when (18a), (18b) are in the neutral position.

(V2), Z number of 3 to prevent pressure oil flow from (Vl)
Of the five two-position switching valves (y, + to yI,) that constitute the position switching valve (xt to aya) and are individually operated by pilot pressure from the three-position switching valves (X1 to X6), Valve mechanism (y) consisting of three traveling systems (ya, (ya, (egg)
The drive system hydraulic clutch (2) is connected to the hydraulic clutch (2) of the power take-off system, and the power take-off system hydraulic clutch f (II) is connected to the power take-off system (y5), and the power take-off system hydraulic clutch f (II) is connected to each other. )
, (va, (Vl)) are configured to be largely automatically operated in conjunction with the gear shift operation.

In addition, in the figure (the sea bream is the relief valve (2) for the pump (P)
Paired clutch using 0 circuit +21, (11)
This is a lubricating oil supply path.

The two-position switching valve (main transmission 11 among yz to yρ)
A pair of two-position switching valves (ya, (ya) for the clutch (2) are installed in series with the operating oil passage 12 of the clutch (2), as well as a co-position switching valve (y3).
, (y4) are in different operating states (that is, one of the two shift gears (&) in the main transmission is in an operating state and the other is in an inoperative state), the clutch (2) is activated. It is configured to allow the flow of pressure oil to make the transmission start-up state steeper, and thereby the traveling gear shift knob (v
When the shifter (a) is in the neutral gear shift state, the pressure oil supply to the clutch (2) is blocked and the clutch (2) is placed in the transmission disengaged state.
Even if both position switching valves (ys) and (ya) are in the pressure oil supply state due to a problem such as incomplete operation in (b), the pressure oil supply to the clutch (2) is also blocked. The clutch (2) is then placed in the transmission disengaged state, and the driver is notified of the occurrence of trouble by stopping the drive of the vehicle body.

Moreover, the two two-position switching valves (ys) t (5'a) for the power extraction transmission (10) are also the same as the two two-position switching valves (ya), (Y
The configuration is similar to 4), and the occurrence of trouble in the power take-off system is notified by stopping the power take-off shaft (I2).

In addition, two sifuku f&), (b), (e),
(f) The specific transmission structure of the main transmission (1) and the power extraction transmission (lO) equipped with
), (f) The clutch +21, (11) that is automatically operated in accordance with the switching operation of each transmission tl+,
Instead of placing it on the lower side of the transmission as in (10), it may be placed on the upper side of the transmission. In that case, when a problem occurs, the clutches (2+ and (+1) are automatically disengaged to double the speed of each transmission gear. Transmission device by occlusion etc. 11), (
10) There is an advantage that damage can be prevented.

Also, a pair of shifters (a), (b) and (e),
The two-position switching valves (ya), (ya), (ys), and (ya) are automatically opened and closed in accordance with the switching switch in (f).
Valve (x3), (x4), which operates with pilot pressure
'(xa), (age is for each actuator (13a)
, (13b), (18a), (18b), instead of configuring the plunger (+9) as a sliding spool,
Various configuration changes are possible, such as configuring it as a separate unit, and these are collectively referred to as pilot pressure valves.

(I4), (Xρ, (referred to as age).

Furthermore, a pair of two-position switching valves (ya), (ya)・
(ya.

The specific pilot pressure operation structure etc. of (y,) can also be changed to the 6th name.

The present invention is directed to a nine-wheel drive system equipped with a hydraulically operated transmission for various types of equipment such as agricultural and construction equipment.

[Brief explanation of the drawing]

The drawings illustrate embodiments and conventional examples of the transmission device according to the present invention, FIG. 1 is a schematic overall plan view showing the drive structure, FIG. 2 is a hydraulic circuit diagram, and FIG. 3 is a circuit diagram showing the conventional structure. be. Il,)...Transmission, (2)...Clutch, (2?...Operation? Yuraku, (a), (
b)...Shifter, (xa), (x,)...
...Valve for pie four 1-EE, (y)...
Clutch operation valve mechanism, (y3), (y4)...
・Pulp for flow path switching.

Claims (1)

[Claims] The pilot pressure pulps (xa) and (X4) are applied to two hydraulically driven shifters (a) and (b), respectively, which are provided in the transmission (・1) so as to be in an alternative transmission state. The operating oil passage for the clutch (2), which is attached and installed in series with the transmission (1), to be opened and closed when switching between the transmission state and the non-transmission state in (a) or (b). , the above-mentioned both pilot pressure valves (X3), (X
, ) is operated by opening and closing the clutch operation valve mechanism (
y), in which the clutch operation valve mechanism (y) is configured with the pilot pressure pulp (y).
Two flow path switching pulps (ya, (y4) each operated separately by x3) and (x,) are arranged in series,
A transmission device characterized in that the clutch (2) is configured to be in a transmission or disengaged state only when both the shifters (a) and (b) are in a non-transmission state and a transmission state.