JPS6049156A - Hydraulic operation type travel speed changer - Google Patents

Abstract

PURPOSE:To enable a speed change at a high speed by providing an accumulator of the captioned speed changer so as to discharge the pressure oil to the oil passage portion upstream speed change control valves during the speed change operation and to store the pressure oil fed to transmission clutch operation hydraulic cylinders. CONSTITUTION:In a travel speed changer provided with multiple gear speed changers and transmission clutches in series on a travel transmission system, speed change control valves V1, V2 for speed change shifter operation hydraulic cylinders of individual gear speed changers and clutch control valves S1, T1-T3 for transmission clutch operation cylinders are provided. Individual valves S1, T1-T3 are automatically transferred during the speed change operation so that they are transferred to the operation position only under the transmission condition of the gear speed changers. An accumulator A is provided so as to discharge the pressure oil to the oil passage portion upstream the control valves V1-V2 during the speed change operation and to store the pressure oil fed from the valves S1, T1-T3 to the transmission clutch operation hydraulic cylinders.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a traveling transmission system with a gear transmission and a friction plate type auxiliary clutch in series, and a control valve for a hydraulic cylinder for operating a speed shifter in the gear transmission;
and the clutch control valves for the hydraulic sills for operating the clutch described in Section 111 are connected to one hydraulic pump,
111 Relating to a hydraulically operated traveling transmission device in which the clutch control valve is configured to be automatically switched in conjunction with a gear shift operation in order to switch the clutch control valve to the ON operation position only in the transmission state of the gear transmission device IIJ. In such a traveling transmission, there is no need to remain in an unnecessary neutral state for a long period of time during a switching operation for the gear transmission, and there is a tangle that causes the traveling speed to drop significantly when changing gears. It is desirable to avoid
On the other hand, after operating the gear transmission, it is desirable to avoid sudden engagement of the transmission clutch to avoid troubles such as unpleasant vibrations. Since pressurized oil from seven hydraulic pumps is simply supplied to each of the clutch operating cylinders at 7 tIA, it is not possible to satisfy both of the above requirements.

In particular, conventionally, the main relief valve attached to the #J passage above both control valves determines the operating pressure for engaging the transmission clutch, but in this O8 case, in order to reduce the pump driving load, As a result of setting the pressure of the main relief valve to a pressure close to the minimum pressure required to engage and operate the metal clutch, some of the pressure oil from the pump is used as the main pressure when operating a gear transmission that requires more pressure than a transmission clutch. Before the relief pulp is discharged, the operation of the gear transmission must be carried out at the desired 5th speed.Of course, a cylinder with a sufficiently large diameter is used as a hydraulic cylinder for operating the transmission shifter. The above-mentioned disadvantages can be solved by doing so, but the overall structure becomes larger and
However, it has the disadvantage of increasing costs and is difficult to put into practical use.

The present invention was made in view of the above-mentioned actual situation), which is a 1-ton item,
The first purpose is to make the Gamme speed device N by simple modification.
The purpose of this is to enable the transmission clutch to be engaged at a slow speed while the gear change operation for the VC can be performed at high speed.The second purpose is to reduce the pump drive load in addition to the first purpose above. The object of the present invention is to enable the speed change operation of the gear transmission device to be performed at a higher speed while reducing the amount of noise.

The characteristic configuration of the hydraulically operated traveling transmission device invented by Mizutoshi 1 is that the accumulator is connected to a
ε Condition in which the oil is discharged to the upper side/road portion of the transmission control valve - 1 s neJ Clutch control valve A point provided to accumulate the pressure oil supplied to the hydraulic cylinder for operating the transmission clutch. Its functions and effects are as follows.

That is, when operating the gear transmission, the 1st royal oil accumulated in the accumulator is also supplied to the hydraulic cylinder for operating the transmission shifter, so that the cylinder can be operated at high speed, and moreover, the transmission clutch is engaged. During operation, a portion of the pressure oil supplied to the clutch operation cylinder is accumulated in the accumulator, and
The clutch engagement operation pressure is gradually stopped so that the half-clutch state is stopped for an appropriate period of time.

Therefore, even if the clutch manual operation pressure is determined by the main relief pulp, the speed change operation speed for the gear transmission device can be increased to perform a good traveling shift without significantly reducing the traveling speed. Make sure that the clutch is not engaged suddenly, and then start again at the desired speed after shifting to 114 without causing any unpleasant vibrations.
It can be operated smoothly, and has a simple structure that makes effective use of seven accumulators, making it a hydraulically operated transmission that can be used conveniently. b1).

The I-mechanical aspect of the hydraulically operated traveling transmission according to the second invention includes a sub-relief valve having a lower pressure than the main relief pulp attached to the oil passage 111 (in the upper side of both the control valves) for the clutch operation. It is connected to the oil passage part of F hand out from the control valve, and when the accumulator metal and gear shift operation are performed,
The oil is discharged to the oil passage on the one hand side of the gearshift control valve 11ilJ, and one is supplied from the clutch operation control valve 1lfJ to the transmission clutch operation hydraulic cylinder mJ. The point is that the pressure oil that acts as i is provided in a state that causes +W Ii't, and its effects are as follows.+1 II).

That is, in addition to obtaining the same effect as the first invention, in addition, by setting the main relief pulp to a high pressure while determining the manual clutch operation pressure using the sub-relief valve, the main relief pulp is released during operation of the gear transmission. By suppressing part of the pressure oil from being discharged, the cylinder for operating the transmission shifter -Iiii! , can be operated at island speed.

Therefore, is it the same effect as IJ4 with one shot of Mizuo? In addition, while reducing the pump driving load, the speed change operation speed for the gear transmission device can be kept sufficiently high, thereby eliminating as much as possible the undesirable drop in travel speed caused by the gear change operation. As a result, it has become possible to perform even better shifting while driving.

Hereinafter, an embodiment of the F1 tree will be explained based on the drawings.

Figure 1 shows the transmission structure inside the transmission case (M) equipped on the tractor in purple, and shows the input shaft (fl) interlocked with the engine (E) and the first transmission shaft (2) for traveling. A synchronized mesh type main gear transmission (1) that can freely change gears is provided, and a friction plate type transmission clutch (1) is provided between the first transmission shaft (2) and the second driving transmission shaft (3), 2 transmission shaft (3
) is a sink D-mesh type 11-speed reverse gear transmission (Hl) that has one forward and reverse speed, and a synchromesh type first auxiliary gear transmission (Hl) that can freely switch the output from H1 to two high and low speeds.
H3) and a second auxiliary gear transmission (Hl) that can freely switch the output from Nanano 1 into two high and low stages, and
The output of the second auxiliary gear transmission (H4) is changed to the rear IPIiilf.
41 differential mechanism (4A) and 1iiJ@(5) differential # mechanism (5A).

A synchromesh type gear transmission (7) is provided to shift the power of the input shaft fi+ to the input shaft (fi+) and transmit it to the power extraction transmission shaft (6), and the transmission shaft +61 and the power extraction shaft (8) A friction plate type transmission clutch (9) is provided between the two, and the power extraction shaft (8) is configured to be able to change speed.

Next, the gear shift operation structure for the running transmission thread will be described in detail based on FIG. 14 and FIG. Hydraulic cylinders (101, 2 side noise) are installed, and hydraulic cylinders (1, 21, 7, +21, 1. The oil field cylinder 101 for main gear shifting is attached with a hydraulic cylinder for engaging the transmission clutch (Q&T).
(101 and the first sub-transmission hydraulic shilling (171)
a main control valve (V+) for each, and an auxiliary control valve (v2) i for between the hydraulic cylinders for backward movement change described in 41,
It is connected in parallel to the oil field pump (P). And 11
1.Each hydraulic cylinder (8 position V in a bag where the piston of 111 @ is also used as a sliding spool) switching valve (S+)
, (S?).

(Ss) and (Sl) are configured, and the lf oil from the switching valve (Sl) configured with the oilfield cylinder for reverse gear shift (I) is transferred to the hydraulic cylinder for clutch operation (l (to)). Supply oil 1fAO threat t- is provided, and its oil passage (1
Pilot pressure operated switching valve (r+) for opening and closing
, (rs, (T3)) are arranged in series,
Hydraulic cylinder for upper gear shifting 1101', [
0) and the first auxiliary transmission hydraulic cylinder are provided in a condition to be operated by pressure oil from the switching valves (S3), C84) and (Sl), and thereby the clutch operation is performed. Bu f (S+), ('
r+ ), (Ty), (Ts) k, the main gear transmission (Hl), the 1111 reverse gear transmission (H2), and the first auxiliary gear transmission a(3) are engaged only in the sudden transmission state. In order to change the gears to the above, the gear shift operation is automatically performed in conjunction with the gear change operation.

(11) When one of the two hydraulic cylinders of the main gear transmission (HJ) is operated to the shift side, the hydraulic cylinder (10) of the main gear transmission (HJ) is moved to the shift neutral position I.
PtKEfJ1] is configured to prevent operation retention. In addition, the second [11II gear y speed device (H4
) is equipped with a shifter that can be operated using the gear lever. Furthermore, a transmission (
7) and the transmission clutch (9) as described above.
It is configured to be hydraulically operated, as is the structure.

main and auxiliary control valves ffl ), (Vt ) and clutch pre-operation control valves (, StJ, (Tt), (T, ri, (T
a) J: The main relief pulp ll5) is completely installed on the upstream side of the flow path, and the drained oil from the tL is supplied to the transmission clutch (Q) for lubrication.

However, the main relief pulp (15) (11-1 transmission clutch (11-1) is set at 20 kg/in order to prevent the operating pressure of Q from becoming excessively loud.

Accumulator (A) t, valve (S+), which controls the clutch action, in a state where the oil is discharged to the upper side of the oil passage than the front and auxiliary control valves (Vr), (Vy) with the speed change operation. It is provided to store the pressure oil supplied from Tt), (Tz), and (Tx) to the hydraulic cylinders for clutch operation. However, in the figure (16a), (
lflb) is a reverse 1-hi valve that prevents unnecessary discharge and accumulation of pressure oil.

FIG. 3 shows another embodiment, main and auxiliary control valve (Vr)
, (V) is a sub-relief valve with a lower pressure than the main relief valve (setting pressure is θkg/m) attached to the upper side of the oil passage (15A) (setting pressure is 20kg/c+).
J) (lno, the valve that controls the clutch operation (St)
.

(T+), ('r*), (-Is), and connects to the lower side oil passage part, as well as the above-mentioned accumulator (
A)'t K<extreme.

The hydraulically operated traveling transmission device of the present invention can be applied to various work vehicles such as a pond for the tractor VC4, a combine harvester, etc., and the number of gears and the specific configuration of the gear shift can be variously changed depending on the intended use.

[Brief explanation of the drawing]

The drawings show all embodiments of the hydraulically operated traveling transmission according to the present invention, FIG. 1 is a schematic diagram of the transmission structure, FIG. 2 is a hydraulic circuit diagram for shifting, and FIG. 3 is a hydraulic circuit diagram of another embodiment. It is. (10), +10. (i...Hydraulic Schilling, gift...Hydraulic Schilling, (15A)...
・Main relief valve, sub-relief pulp, (5)...accumulator, (H+
), (Hz), (HsJ...Gear transmission, (
Pl...Hydraulic pump, (vt), CVt)
・・・・・・Shift control valve, (S+), (T+),
(Tz), ('rx) --Clutch control valve.

Claims (1)

[Claims] ■ A gear transmission @ (Ht), (Hz) in the traveling transmission system.
, (Hs) and friction plate type transmission clutches (C) are provided in 11 rows, and 11J gear transmissions (Hl), (Hz), (H
s) Hydraulic cylinder for operating the gear shifter in K (tol
, ' iul , (12) for the speed change control valve (
Vl ), ('v2), and the clutch control valve (S+
), (Tt ), (L), ('Is) dog kfz, connected to one hydraulic pump (P), one valve for 1llfffi clutch (S+), CT+), (T+J, ('rs
the gears (Hl), (Ht), (H
In order to switch to the 17J operating position only when the transmission condition is sudden (s), the switching operation is automatically set to 1" with the gear shifting operation.
The hydraulically operated travel transmission is equipped with an accumulator (8), and the shift control valve (vL) is discharged into the upper oil passage during the shift operation. in,
In addition, the control valve for the clutch clutch +)-('r+)
, (TtJ, (071) Hydraulic operated traveling transmission device that is provided in a state where pressure oil is accumulated for operating the transmission clutch from rsJ to 071. Hl ), (Hl
), 田, ) and the friction plate type transmission clutch (C) are provided in series, and the gear transmission device (Hl)-<Ht), CHs
Hydraulic sill for speed change taffeta operation in ) (101,
f river, (speed control valve for country (Vl) - (Vl),
and a hydraulic cylinder (13) for operating the clutch (Q).
clutch control valves (S+), (T+), (Tz
), (rx) dogs are connected to seven hydraulic pumps (P), and the clutch control valves (S+), (Tt) - (Tt)
, (Ts), 111th gear transmission (L), (Hp
), (Hs ), the hydraulically operated traveling transmission is provided so as to be automatically switched in accordance with the gear shifting operation in order to switch to the engaged position only when the transmission state is sudden. Vl), (Vl) and (Sl), (Tt),
(Tt), (Ts), the sub-relief valve 9''h, which has a lower pressure than the main relief valve (15A) attached to the upper oil passage, is connected to the clutch operation control valve (SxJ
- (Tx), (Ts), (Is 8 are also connected to the oil passage part on the lower side, and the accumulation rake (N) is used to control the speed change when the speed change operation is performed. When the oil is discharged to the side oil passage,
The clutch operation control valves (S+), (Tt), (Tz
)'. (r3) A hydraulically operated transmission device configured to accumulate pressure oil supplied to a hydraulic cylinder for operating a transmission latch.